Atower casts a 450 ft shadow at the same time that a 4 ft child casts a 6 ft shadow. write and solve a proportion to find the height of a tower

The lengths of two sides of a right triangle are given. find the length of the third side. round to the nearest tenth if necessary. a) y = 12/5x + 39/5 b) y = 5/12x + 5/39 c) y = 12/5x - 39/5 d) y = 5/12x - 5/39