Tuesday

March 3, 2015

March 3, 2015

Posted by **Erin(im so confused!)** on Sunday, January 13, 2008 at 9:08pm.

9/12=15/?

please help.

- Math... -
**Jake1214**, Sunday, January 13, 2008 at 9:11pm9 and 15 are the numerators

12 and ? are the denominators

Start the problem by setting up an equation by multiplying the numerators with the denominators like this:

9 x ? = 12 x 15

Now just solve for ?

- Math... -
**Damon**, Sunday, January 13, 2008 at 9:16pmIt is ok to cross multiply but I prefer to multiply both sides by the product of the denominators. It is easier to justify by the rules of equation solving.

(9/12)(12 x) = (15/x)(12 x)

9 x = 15*12

**Answer this Question**

**Related Questions**

algebra - Solve each porportion. 2/3 = 1.2/x x=?

Pre algebra - Solve the porportion w/7 is equal to 36/42

algebra - solve the porportion 2/7 = x/42 the answer is below, but which one A...

math156 - x/3 = x+10/6 it would read as x over 3 = x plus 10 over 6 I have no ...

math - exmple of porportion and ratios in your daily lives.

Statistics - Test a claim p=0.5 with the significance level of 0.05 and n=49 ...

Math Help! - Mrs. Miller sells a house for $179,000. If she earns a commission ...

Math help please - 1. Solve for x. 4(x - b) = x b = 4/3x b = 3/4x x = 4/3b x = 3...

Math - For every girl taking classes at the martial arts school, there are 3 ...

math 12 - i got the wrong answer from the back, and i know that imnot dooing it ...