# Fractions in a probablity problem?

• April 15th 2009, 12:16 PM
Verranicus
Fractions in a probablity problem?
So, I've been doing problems on probablity. Stuff like:

12 over 9 = x over 7, solving for x.

2/7 over 3/4 = 5/6 over x

I have NO idea how to even begin. Help? D:
• April 15th 2009, 02:17 PM
Showcase_22
$\frac{\frac{2}{7}}{\frac{3}{4}}=\frac{\frac{5}{6}} {x}$

$\frac{2}{7}x=\frac{15}{24}$

...and I think you can take it from here.(Cool)
• April 15th 2009, 02:22 PM
e^(i*pi)
Quote:

Originally Posted by Showcase_22
$\frac{\frac{2}{7}}{\frac{3}{4}}=\frac{\frac{5}{6}} {x}$

$\frac{2}{7}x=\frac{15}{24}$

...and I think you can take it from here.(Cool)

$\frac{\frac{a}{b}}{\frac{c}{d}} = \frac{a}{b} \times \frac{d}{c}$

For your example do what the guy above said