The Volume and surface area of a sphere is 4/3πr^3 and 4πr^2 respectively. V=4/3πr^3 and S=4πr^2. Write a) S in terms of V and b) V in terms of S

I'm stuck on this question... I write out similar base units and stuff but it doesn't seem to work, any help on the steps I should take to tackle this question?

The answer to part a) -

S=2^2/3 3^2/3 π^1/3 V^2/3

I know the answer as its written on the book but I don't know the steps involved

Thanks.