I am trying to rearrange this eqaution to solve for R. Z=300R^1.4

Question

 Z is reflectivity and R is rainfall rate. Again, the equation is z=300 R^1.4 and I need to rearrange the question to solve for R

Answer 1

Z = 300R^1.4       1.4 = 1 4/10 = 1 2/5 = 7/5

Z/300 = R^7/5

^7/5√(Z/300) = R