R Ryan$ Full Member Joined Jan 25, 2019 Messages 291 Apr 9, 2019 #1 Hi guys, I just want to verify about something: why it's right that if I want to calculate x over this equation: a:b x:c then to calculate x, I do (a*c)/b , why it's right? it makes no sense for me, any clue why that rule is always right?!

Hi guys, I just want to verify about something: why it's right that if I want to calculate x over this equation: a:b x:c then to calculate x, I do (a*c)/b , why it's right? it makes no sense for me, any clue why that rule is always right?!

R Romsek Full Member Joined Nov 16, 2013 Messages 336 Apr 9, 2019 #2 \(\displaystyle \dfrac a b = \dfrac x c \) multiply both sides by \(\displaystyle c\) \(\displaystyle \dfrac{a c}{b} = \dfrac{c x}{c} = x\)

\(\displaystyle \dfrac a b = \dfrac x c \) multiply both sides by \(\displaystyle c\) \(\displaystyle \dfrac{a c}{b} = \dfrac{c x}{c} = x\)