SOLUTION: http://prntscr.com/aa3tc4 I keep tying to solve by setting up proportions (which our teacher wants us to do using the side-splitter-theorem), but I keep getting the wrong answer.

Algebra ->  Triangles -> SOLUTION: http://prntscr.com/aa3tc4 I keep tying to solve by setting up proportions (which our teacher wants us to do using the side-splitter-theorem), but I keep getting the wrong answer.       Log On


   

Question 1022876: http://prntscr.com/aa3tc4
I keep tying to solve by setting up proportions (which our teacher wants us to do using the side-splitter-theorem), but I keep getting the wrong answer.
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Number 9 Exercise:

Let the question-marked length be x.
x%2F18=4%2F%284%2B8%29
x%2F18=4%2F12
x=18%284%2F12%29
x=18%281%2F3%29
x=6