Answer :
You cross multiply and solve for the unknown variable.
Here's an example:
[tex]\sf\dfrac{2}{3}=\dfrac{6}{x}[/tex]
Cross multiply:
[tex]\sf3\times6=2\times~x[/tex]
[tex]\sf18=2x[/tex]
Divide 2 to both sides:
[tex]\sf~x=9[/tex]
Here's an example:
[tex]\sf\dfrac{2}{3}=\dfrac{6}{x}[/tex]
Cross multiply:
[tex]\sf3\times6=2\times~x[/tex]
[tex]\sf18=2x[/tex]
Divide 2 to both sides:
[tex]\sf~x=9[/tex]
One way is to cross multiply and then solve from there.
Example:
10/x = 2/5
(10*5 = 2*x)
50 = 2x
(50/2)
25 = x
10/25 = 2/5
Example:
10/x = 2/5
(10*5 = 2*x)
50 = 2x
(50/2)
25 = x
10/25 = 2/5