CPM Homework Help : PC3 Problem 4-89

A right triangle, horizontal leg labeled x, and vertical leg, labeled h, The horizontal side is extended, past the right angle, extended segment labeled 5, creating a horizontal leg, of a larger right triangle, with the same shared angle opposite the vertical legs. The vertical leg on the larger right triangle, is labeled, 10. Review the diagram at right.

Write an equation for $h$ in terms of $x$ .
Hint:
Use similar triangles. It might help to draw the triangles separately before writing your equation.
If $h=3.2$ , what is the value of $x$ ?