If
m2 = m1*d1/d2
what is d1 and d2
when m1 is 50 and m2 is 84
you have 4 unknowns in your equation, but only 2 are given, so ...
84 = 50(d1/d2)
42/25 = d1/d2
there is no unique solution to d1 and d2, but any two numbers in the ratio 42:25 would work.