# How do you write a problem that can be solved using proportions. Write the proportion and solve the problem?

Jul 13, 2017

A proportion problem is written and solved by setting up two equilivant fractions.

#### Explanation:

An common example is a percentage problem. The percent can be written as a fraction with a denominator of 100. The equilivant fraction is written as the part over the whole

 (part)/(wh) = %/ 100 If you know the percent and the total or whole it is possible to solve for the part or amount of the percentage can be solved using a proportion.

 x/120 = (15%)/100 Multiplying both sides by 120 will leave the unknown isolated by itself (x)

$\frac{x}{120} \times 120 = \frac{15}{100} \times 120$

this gives

$x = 18$