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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