7 Ways To Solve Proportions
312=19x{\displaystyle {\frac {\color {blue}{3}}{\color {blue}{12}}}={\frac {19}{x}}} How are 3 and 12 related? 3×4=12{\displaystyle 3\times {\textbf {4}}=12} The other vertical column is related the same way: 19×4=x{\displaystyle 19\times {\textbf {4}}=x} x=76{\displaystyle x=76}, so 312=1976{\displaystyle {\frac {3}{12}}={\frac {19}{76}}} x5=3610{\displaystyle {\frac {x}{\color {orange}{5}}}={\frac {36}{\color {orange}{10}}}} What is the relationship between 5 and 10? 5×2=10{\displaystyle 5\times {\textbf {2}}=10} The other horizontal row is related the same way: x×2=36{\displaystyle x\times {\textbf {2}}=36} x=18{\displaystyle x=18}, so 185=3610{\displaystyle {\frac {18}{5}}={\frac {36}{10}}}...