#### Answer

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