If a/4 = b/7, what is the value of a/b?

Can somebody guide me through a step by step please? I know it's cross multiplication, I just want to make sure I know what I'm doing since I'm a little confused with this one.

1 answer

a/4 = b/7
multiply both sides by 4
a = 4b/7
divide both sides by b
a/b = 4/7