Two similar figures have volume is 27 in.³ 125 in.³ surface area of the smaller figure is 63 in.² find the surface area of the larger figure

When we get the ratio of the volumes of the smaller figure to that of the bigger figure, we get an answer of,
                                          27:125
Then, we get the square root, 3:5. If we square both sides, we get the ratio of the areas. 
                                           9:25
With the given, the surface area of the bigger figure is 
                               63 / 9  = X/25
The value of x 175.