# Chapter 7 - Similarity - 7-1 Ratios and Proportions - Practice and Problem-Solving Exercises - Page 437: 47

This is not a valid proportion; this can be proven by using the Cross Product Property.

#### Work Step by Step

You are given $\frac{10}{26}$ = $\frac{16}{42}$ The Cross Product Property says that the product of the means equals the product of the extremes. So: 42(10) = 26(16) 420 = 416 This is not true, so it is not a valid proportion.

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