## Prealgebra (7th Edition)

First, we translate the question into an equation: $\frac{30}{4} = \frac{x}{22}$ Now, we solve for $x$ by cross multiplying, which states that if $\frac{a}{b} = \frac{c}{d}$, then $ad = bc$. This result can be achieved by multiplying both sides by $cd$. $4x = 660 \rightarrow x = 165$