Two ratios are **equivalent** if their cross products are equal.

Are these ratios equivalent?

The cross products are equal, so the ratios are equivalent.

Are these ratios equivalent?

**3 to 5** and **6 to 10**

* Write the ratios as fractions.*

* and *

Compare the two cross products. Multiply the numerator of one fraction and the denominator of the other.

The cross products are equal, so the ratios are equivalent.