Question 9083
A ratio of two numbers is like a fraction {{{a/b}}}.

A proportion is a ratio of two numbers equal to a ratio of two other numbers:
{{{a/b = c/d }}}.  So, I would say that the ratio is {{{2/5 = a/15}}}.  I suppose if {{{n=1/2}}} had been written in the form {{{n/1=1/2}}}, then that too would have been an example of a proportion.


R^2 at SCC