## Elementary Geometry for College Students (6th Edition)

$WV=12$
Given that the two triangles are similar, then their corresponding sides are proportional. $\frac {RT}{WU} =\frac {TS}{WV}$ Substitute in known values (and $x$ for the unknown value... $\frac {4}{6}=\frac {8}{x}$ Cross Multiply... $4x=48$ Divide both sides by 4... $x=12$ or $WV=12$