Question 387809
  <pre><font size = 3 color = "indigo"><b>
Hi,         
Let x represent how much gasoline will he need to travel 528 miles
Question Sets Up the Proportion
  {{{5.25gal / 231mi = x/528mi}}}
Cross multiply to solve for x
   231x = 5.25*528
      x = 5.25*528/231
      x = 12 gal, the amount of gasoline he needs to travel 528 miles
CHECKING our Answer
5.25gal / 231mi = .0227 =   12/528mi