# Math

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Help!!! On a blue print scale 1/2 inch = 10 feet. How do I figure out the actual width of the living room whose distance is 3/4 inches

• Math -

One way to figure it out is to let x = the actual width. Cross multiply and solve for x.

(1/2) / 10 = (3/4) / x

30/4 = (1/2)x
(30/4)/(1/2) = x
(30/4) * (2/1) = 60/4 = 15 feet

• Math -

ok thank u!!!! that helps a lot
i will try it?
-celeste

• Math -

You're welcome.

http://www.aaastudy.com/rat-prop-crossx.htm

• Math -

ok well i tryed it and still i don't understand??? can u say so i understand???PLEASE PLEASE PLEASE
-CELESTE

• Math -

MS. SUE WHAT SCHOOL DO U WORK AT????

• Math -

Here's another way to approach this problem.

1/2 inch = 10 ft.
1 inch = 20 ft.

3/4 * 20 = 15 feet

I'm retired.

• Math -

ok thank u got it more but can u help me on other problems they r the same but different #'s

• Math -

If I have different fractions can I multiply the others by 20 as well?

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