Question

$\frac{x}{12} = \frac{3}{9} Use a proportion. Find missing value.$

Answer 1

Answer:

$x=4$

Step-by-step explanation:

Cross-multiply to simplify:

$\frac{x}{12}=\frac{3}{9},\\9x=12\cdot 3,\\9x=36$

Divide both sides by 4 to isolate $x$:

$x=\frac{36}{9}=\boxed{4}$