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.

## Answer This Question

## Related Questions

- Math ---HELP!!!!! - 30% of the fifth grade students in a large school district ...
- Math ---HELP!!!!! - 30% of the fifth grade students in a large school district ...
- Math - At Jefferson School, both 6th grade & 7th grade classes take a math test...
- Statistics - 2.5 Points 30% of the fifth grade students in a large school ...
- math - What is the solution to the proportion shown below? (x+3)/4 = (x+2)/3
- math - What is the solution to the proportion shown below? (x+3)/4 = (x+2)/3
- Math - What is the solution to the proportion shown below? (x+3)/4 = (x+2)/3
- math - The ladders shown below are standing against the wall at the same angle. ...
- Math - If a grade was drawn at random from the data shown below, what is the ...
- Math - How many 7th grade students are expected to move by the end of the year? ...

More Related Questions