Question

solve for z in the proportion.
$\frac{65}{70}=\frac{39}{z}$
$z = square$

Explanation:

Step1: Cross - multiply

$65z = 70\times39$

Step2: Calculate the right - hand side

$70\times39 = 2730$, so $65z=2730$

Step3: Solve for z

$z=\frac{2730}{65}=42$

Answer:

$42$