Answer
RK=1$\frac{4}{9}$
Work Step by Step
$\frac{RK}{KT}$$\times$$\frac{TH}{HS}$$\times$$\frac{GS}{RG}$=1
$\frac{RK}{3}$$\times$$\frac{5}{4}$$\times$$\frac{4}{3}$=1
5RK=9
RK=1$\frac{4}{9}$
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