Using the ratio of two corresponding sides, you can find that the left figure has been scaled up by a factor of 1.5. This can be found by doing the following:
[tex] \frac{6}{4}, \frac{3}{2} [/tex] or, [tex] \frac{9}{6} [/tex] which all = 1.5
Using this scale factor, you can multiply 8 by 1.5 to get your answer
x = 12
