Proportion

What is c when b=3?

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$a:b=c:a\\ a^2=bc\\ a:9=5:a\\ a^2=45\\ bc=45\\ 3c=45\\ c=15\\ \color{blue}c=15\ when\ b=3$

  !

$I \ don't \ like \ you \ asinus \ \begin{vmatrix} dum&dum&dumb \\ dum&dum&dumb \\ dum&dum&dumb \end{vmatrix}$