# How wide is the actual house if a model house is 12 inches wide and it was built with a ratio of 3 inches : 4 meters?

The ratio of 3 inches : 4 meters can be written as two fractions which can be used as conversion factors. They are $\text{3 inches"/"4 meters}$ and $\text{4 meters"/"3 inches}$.
$\text{12 inches}$ x $\text{4 meters"/"3 inches}$ = $\text{16 meters}$
The width of the actual house is $\text{16 meters}$.