A cone and a triangular pyramid have a height of 9.3 m and their cross-sectional areas are equal at every level parallel to their respective bases.

A cone and a triangular pyramid are shown. Both have a height of 9.3 meters. The cone has a diameter of 6 inches. The pyramid triangular base has side lengths of 3.3 inches and x.

What is the height, x, of the triangle base of the pyramid? Round to the nearest tenth.