The following two triangles are similar to each other. Find the length of the side labelled x.
There are two triangles. The one on the right is smaller, and the one on the left is larger. For the bigger triangle, its base is marked as x, and its right side is marked as 21 ft. For the smaller triangle, its base is marked as 42 ft, and its right side is marked as 17.5 ft.
Use ft for feet.
The missing side’s length is