math
posted by makeeda .
you traveled 189 miles on 7 gallons of gasoline. at this rate how many gallons of gasoline would you need to travel 297 miles?
A)11
b)14
C)20
D)15.5

i need help

Set up a proportion and solve for the unknown.

i don't know how to set up a proportion

Please see my previous explanations and study the proportions part of this page carefully.
http://www.homeschoolmath.net/teaching/proportions.php 
14