$\"\"$

In the percent proportion, the ratio of a part of something (part) to

the whole (base) is equal to the percent written as a fraction. $\"\"$

$\"\"$

The part a = 18

The base b = 60

Replace a with 18 and b with 60.

$\"\"$

$\"\"$ (Means-extremes Property of proportion: If $\"\"$ , then ad = bc.)

$\"\"$ (Divide each side by 60)

$\"\"$ (Cancel common terms)

$\"\"$ (Simplify: $\"\"$ ) $\"\"$

Eighteen is 30% of 60.