$$\frac { z } { 3 } = \frac { 5 } { 4 }$$
$z = \frac{15}{4} = 3\frac{3}{4} = 3.75$
$$z=\frac{5}{4}\times 3$$
$$z=\frac{5\times 3}{4}$$
$$z=\frac{15}{4}$$
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