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Homework Statement
In an astronomy problem, I am given ##P^2 \propto \frac {a^3}{M_s}## and I must solve for M. How do I use an equation like this? Is this not the same as ##P^2 = \frac {a^3}{M_s}##
Homework Equations
N/A
The Attempt at a Solution
My attempt is to treat the given equation as ##P^2 = \frac {a^3}{M_s}## and solve for ##M_s = \frac{a^3}{P^2}##