Quadrilateral ABCD in the figure below represents a scaled-down model of a walkway around a historic site. Quadrilateral EFGH represents the actual walkway. ABCD is similar to EFGH.

Two irregular similar quadrilaterals ABCD and EFGH are drawn. AB measures 6 inches, BC measures 3 inches, CD measures 3 inches, and DA measures 4 inches. EF measures 72 feet.

What is the total length, in feet, of the actual walkway?