Answer:
[tex]\frac{3}{9}=\frac{4}{x}[/tex]
Step-by-step explanation:
we know that
If two figures are similar, then the ratio of its corresponding sides is proportional
In this problem
Triangle XVW is similar to triangle XZY
therefore
[tex]\frac{YZ}{VW}=\frac{XZ}{XV}[/tex]
substitute the given values
[tex]\frac{x}{4}=\frac{9}{3}[/tex]
[tex]x=3*4=12\ miles[/tex]
