What value of x make the proportion 7.5 over x equal to 18 over 28.8,
Well look: (7.5/x)=(18/28.8), you can cross multiply thus=x*18=7.5*28.8=18x=216,
So we have 18x=216. we divide both sides by 18 and we get,
x=216/18=12,
So, x=12 which is what you want.
