Question

solve each proportion. 3 over 7 equals 12 over x

Answer 1

\[3 \over 7 equals 12 \over x ~becomes\]
\[\frac{ 3 }{ 7 }=\frac{ 12 }{ x }\]

Answer 2

How would you solve this equation for x?
I'd suggest that you cross multiply as a first step. Try this, please.

Answer 3

okay I got \[\frac{ 3x }{ 84 }\]
Is this correct? If so what is my next step?

Answer 4

Cross multiplication should have given you the new equation 3x=84, not the ratio 3x/84.

Solve 3x=84 for x by dividing both sides by 3:

3x 84
-- = ______ = ?
3 3