Solving Proportions.Elementary & Intermediate Algebra

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6 October 2015

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Solving Proportions


Problem 1

            Bear population. To estimate the size of the bear population on the Keweenaw Peninsula, conservationists captured, tagged, and released 50 bears. One year later, a random sample of 100 bears included only 2 tagged bears. What is the conservationist’s estimate of the size of the bear population?

            I think using a simple ratio equation would work here,

let b = bear population


cross multiply the expression

The equation to form will be 2b = 50×100

This will be the first solution to the above equation 2b=5000 divide 2 by 5000

Therefore, the answer will be

5000 =2b

Therefore b=2500 answer

            In conclusion the conservasionists estimated the bear population to be 2500 if the whole population is assumed to remain constant.

Solution to Problem 2

            In the calculation of the second problem on page 444, I am required to solve this equation for y. In order to make everything clear the first thing I decided to work on as well as the first thing I notice is that it is a single fraction (ratio) on the two sides of the equal sign. Most importantly, I basically I realized that it was a proportion which can be solved by cross multiplying the extremes and means. Therefore, I cross multiplied the both sides of the equation

            The following is the solution to the algebraic expression

            y-1 = -3 this problem is a proportion in its own

            x+3 4

            y-1 (x+3 = -3 (x+3) multiply both sides by x+3 – using the extreme means

            Therefore the result of the multiplication is +3 4 property

            Hence -1= -3x+3 add 1 to 3. A number that appears to be a solution but causes 4 0 in a denominator is called an extraneous solutions

            The resulting expression follows below


            4 is the solution

            At the end of the calculation, the appearance of equation I ended up with as the solution to problem 10 would be a linear equation. In conclusion, I noticed that the coefficient of x is different than the original problem is that x+3 and in my problem it is -3x/4.

            I finally realized that I could solve the problem by cross multiplying the equation at the beginning of the problem.


Dugopolski, M. (2011). Elementary & Intermediate Algebra. New York : McGraw-Hill.

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StudyScroll. (2015). Solving Proportions.Elementary & Intermediate Algebra [Online]. Available at: [Accessed: 4 October, 2022]

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"Solving Proportions.Elementary & Intermediate Algebra" StudyScroll, Oct 6, 2015.

"Solving Proportions.Elementary & Intermediate Algebra" StudyScroll, 6-Oct-2015. [Online]. Available: [Accessed: 4-Oct-2022]

StudyScroll. (2015). Solving Proportions.Elementary & Intermediate Algebra. [Online]. Available at: [Accessed: 4-Oct-2022]

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