Dana Oxford

Have two ratios in fraction form.

Step Two:

Multiply the denominator of each ratio by the numerator of the other ratio.

Step Three:

Determine if the ratios can form a proportion.

If two ratios have equal cross products, they form a proportion. If they are not equal, they do not form a proportion.

http://www.math-drills.com/fractions/fractions_equivalent_test_0205_001.pdf