# Chapter 6 - Section 6.2 - Proportions - Practice - Page 425: 9

21.25

#### Work Step by Step

$\frac{17}{z}$ =$\frac{8}{10}$ 8$\times$ z = 17$\times$10 set cross products equal 8z = 170 multiply $\frac{8z}{8}$=$\frac{170}{8}$ z=21.25 Check $\frac{17}{z}$ =$\frac{8}{10}$ $\frac{17}{21.25}$ =$\frac{8}{10}$ $\frac{1700}{21.25}$ =$\frac{8}{10}$ $\frac{8}{10}$ =$\frac{8}{10}$ True 21.25 is the solution

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