Posted by **Lauren** on Sunday, October 14, 2012 at 4:50pm.

A proportion is shown below.

7/10 = 17.5/x

What is the value of x?

- 7th Grade Math -
**Ms. Sue**, Sunday, October 14, 2012 at 5:00pm
Ahh -- ratios and proportions are soooo useful!

7/10 = 17.5/x

Cross multiply.

7x = 10 * 17.5

Solve for x.

7x = 175

x = 175/7

x = 25

- 7th Grade Math -
**Lauren**, Sunday, October 14, 2012 at 5:12pm
this is how I solve, seems totally wrong.

(17.5*7)/10 = x

122.5/10 = x

12.25 = x

x = 12.25

- 7th Grade Math -
**Ms. Sue**, Sunday, October 14, 2012 at 5:16pm
First, you could see it's wrong. Since 7 is less than 10, then 17.5 must be less than x.

Study this site, especially Method 1 under Solutions.

http://www.regentsprep.org/Regents/math/ALGEBRA/AO3/Lprop.htm

- 7th Grade Math -
**morgan**, Sunday, October 14, 2012 at 5:18pm
thank you Ms.Sue :)

- 7th Grade Math -
**Lauren**, Sunday, October 14, 2012 at 5:23pm
Oh i see, thank you for the link, that helps a lot.

- 7th Grade Math -
**Ms. Sue**, Sunday, October 14, 2012 at 5:35pm
You're welcome.

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