Exercise 3 Page 251

The percent proportion is a proportion that sets the ratio of a part of a whole equal to the ratio of a percent out of 100. We can represent a is p percent of wwith the given proportion. part/whole=percent/100 ⇔ a/w=p/100We can find what percent of 36 is 20 is by thinking about 36 as the whole and 20 as the part of the whole. Let's substitute a= 20 and w= 36 into the formula and solve for p using the Properties of Equality.

Knowing the value of p, let's look at the completed percent proportion. 20/36=55.5/100 We found that 20 is 55.5 % of 36.