Present Population given Future Population from Geometrical Increase Method Solution

STEP 0: Pre-Calculation Summary
Formula Used
Last Known Population = Forecasted Population/(1+(Average % Growth Rate/100))^Number of Decades
Po = Pn/(1+(r/100))^n
This formula uses 4 Variables
Variables Used
Last Known Population - Last Known Population is the population of any area of the previous year or decade.
Forecasted Population - Forecasted Population is the population forested usually after n decade or after n years.
Average % Growth Rate - Average % Growth Rate in the geometric increase method is usually found by the arithmetic mean or geometric mean which is the maximum.
Number of Decades - Number of Decades is the year gap of 10 years. Usually, 10 years is equal to 1 decade.
STEP 1: Convert Input(s) to Base Unit
Forecasted Population: 350000 --> No Conversion Required
Average % Growth Rate: 12.82 --> No Conversion Required
Number of Decades: 2 --> No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
Po = Pn/(1+(r/100))^n --> 350000/(1+(12.82/100))^2
Evaluating ... ...
Po = 274976.673335977
STEP 3: Convert Result to Output's Unit
274976.673335977 --> No Conversion Required
FINAL ANSWER
274976.673335977 274976.7 <-- Last Known Population
(Calculation completed in 00.004 seconds)

Credits

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Created by Suraj Kumar
Birsa Institute of Technology (BIT), Sindri
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Verified by Ishita Goyal
Meerut Institute of Engineering and Technology (MIET), Meerut
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Geometric Increase Method Calculators

Average Percentage Increase given Future Population from Geometrical Increase Method
​ LaTeX ​ Go Average % Growth Rate = ((Forecasted Population/Last Known Population)^(1/Number of Decades)-1)*100
Present Population given Future Population from Geometrical Increase Method
​ LaTeX ​ Go Last Known Population = Forecasted Population/(1+(Average % Growth Rate/100))^Number of Decades
Future Population at End of n Decades in Geometrical Increase Method
​ LaTeX ​ Go Forecasted Population = Last Known Population*(1+(Average % Growth Rate/100))^Number of Decades
Future Population at End of 2 Decades in Geometrical Increase Method
​ LaTeX ​ Go Forecasted Population = Last Known Population*(1+(Average % Growth Rate/100))^2

Present Population given Future Population from Geometrical Increase Method Formula

​LaTeX ​Go
Last Known Population = Forecasted Population/(1+(Average % Growth Rate/100))^Number of Decades
Po = Pn/(1+(r/100))^n

What is Population Forecasting and Methods Involved?

Population forecasting is defined as the method of determining the expected population for a particular design period of a water supply system with the help of the study and analysis of future events and available records.
Methods are
1. Arithmetic Increase Method
2. Geometric Increase Method
3. Incremental Increase Method
4. Decrease Growth Rate Method
5. Logistic Curve Method
6. Demographic Method
7. Simple Graphical Method
8. Comparative Graphical Method
9. Master Plan Method
10. Ratio Method

What is Geometric Increase Method?

In this method, the per-decade percentage increase or percentage growth rate (r) is assumed to be constant, and the increase is compounded over the existing population every decade.
It is also known as the uniform increase method.

How to Calculate Present Population given Future Population from Geometrical Increase Method?

Present Population given Future Population from Geometrical Increase Method calculator uses Last Known Population = Forecasted Population/(1+(Average % Growth Rate/100))^Number of Decades to calculate the Last Known Population, The Present Population given Future Population from Geometrical Increase Method formula is defined as the present population when we have prior information on other parameters used. Last Known Population is denoted by Po symbol.

How to calculate Present Population given Future Population from Geometrical Increase Method using this online calculator? To use this online calculator for Present Population given Future Population from Geometrical Increase Method, enter Forecasted Population (Pn), Average % Growth Rate (r) & Number of Decades (n) and hit the calculate button. Here is how the Present Population given Future Population from Geometrical Increase Method calculation can be explained with given input values -> 274976.7 = 350000/(1+(12.82/100))^2.

FAQ

What is Present Population given Future Population from Geometrical Increase Method?
The Present Population given Future Population from Geometrical Increase Method formula is defined as the present population when we have prior information on other parameters used and is represented as Po = Pn/(1+(r/100))^n or Last Known Population = Forecasted Population/(1+(Average % Growth Rate/100))^Number of Decades. Forecasted Population is the population forested usually after n decade or after n years, Average % Growth Rate in the geometric increase method is usually found by the arithmetic mean or geometric mean which is the maximum & Number of Decades is the year gap of 10 years. Usually, 10 years is equal to 1 decade.
How to calculate Present Population given Future Population from Geometrical Increase Method?
The Present Population given Future Population from Geometrical Increase Method formula is defined as the present population when we have prior information on other parameters used is calculated using Last Known Population = Forecasted Population/(1+(Average % Growth Rate/100))^Number of Decades. To calculate Present Population given Future Population from Geometrical Increase Method, you need Forecasted Population (Pn), Average % Growth Rate (r) & Number of Decades (n). With our tool, you need to enter the respective value for Forecasted Population, Average % Growth Rate & Number of Decades and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
How many ways are there to calculate Last Known Population?
In this formula, Last Known Population uses Forecasted Population, Average % Growth Rate & Number of Decades. We can use 2 other way(s) to calculate the same, which is/are as follows -
  • Last Known Population = Forecasted Population/(1+(Average % Growth Rate/100))^2
  • Last Known Population = Forecasted Population/(1+(Average % Growth Rate/100))^3
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