Solving Proportions

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you determine if two ratios form a proportion?

Back

Two ratios form a proportion if the cross products are equal.

Front

What is the cross-multiplication method?

Back

The cross-multiplication method involves multiplying the numerator of one ratio by the denominator of the other ratio to check for equality.

Front

Back

x = 2

Front

If Mr. Dulin runs 5 miles in 42 minutes, what is his speed in miles per minute?

Back

Front

How do you find the time it takes to run a longer distance using proportions?

Back

Set up a proportion using the known distance and time, then solve for the unknown time.

Front

Back

x = 8

Front

What is the first step in solving a proportion?

Back

The first step is to cross-multiply the ratios.

Front

If the ratios are 4:5 and 8:10, do they form a proportion?

Back

Yes, because 4 * 10 = 5 * 8.

Front

What is the formula for finding a missing value in a proportion?

Back