## Geometry: Common Core (15th Edition)

$\frac{9}{4}$=$\frac{L}{52}$; 117 mm
You are given the proportion of length to width, so: $\frac{9}{4}$=$\frac{L}{W}$ You are also given the width, so substitute in for w: $\frac{9}{4}$=$\frac{L}{52}$ Cross multiply to solve for the length: 4L=9(52) 4L=468 L=117 mm