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8/a=12/b=16/c
a+b+c=45
entonces
8/a=12/b tambien 8/a=16/c
8·b=12·a 8·c=16·a
b=12·a/8 simplifico c=16·a/8 simplifico
b=3·a/2 c=2a
sustituyo b y c en la ecuacion a+b+c=45
entonces
a+3·a/2+2a=45
a+3·a+2·a=45/2
6·a=45/2
a=45/2·6
a=45/12 simplifico
a=15/4