Read the passage below and solve the questions based on it.
In the figure given below a square ABCD is inscribed in a circle of radius 5 cm. The square ABCD is inscribed by a circle which is inscribed by a triangle EFG. The triangle EFG is inscribed by a circle which is again inscribed by a triangle XYZ.
Find the ratio of the radius of the outermost circle to the radius of the radius of the circle inscribed in triangle XYZ.