[tex](a;b;c) \ direct \ proportionale \ cu \ (4;6;9) \\ a+b+c=\bold{76} \\ 4+6+9=\bold1{9} \\ k=76:19 \\ \boxed{k=4} \\ \frac{a}{4}=4 =\ \textgreater \ a=4*4=\bold{16} \\ \frac{b}{6}=4 =\ \textgreater \ b=4*6=\bold{24} \\ \frac{c}{9}=4=\ \textgreater \ c=4*9=\bold{36} \\ \bold{Proba:}16+24+36=\boxed{76}[/tex]
