Question

how do you solve proportions like
1/3=x/12

Answer 1

Cross multply

Answer 2

If \[\frac{a}{b} = \frac{c}{d}\]Then \[a \times d = b \times c\]

Answer 3

Algebra. Cross multiplication doesn't make sense if you don't understand why it works

\[\huge \frac{12 }{ 1 } *\frac{ 1 }{ 3 } = \frac{ x }{ \cancel{12} }*\frac{ \cancel{12} }{ 1 }\]