Posted by **Gaby** on Thursday, December 11, 2008 at 6:49pm.

On a set of bluepints the scale is half an inch=4feet

Find the actual lengthof a room that measures 2.8 inches on the blueprint

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**bobpursley**, Thursday, December 11, 2008 at 6:59pm
How many half inches are in 2.8 inches? that is how many 4 feet are in the room.

Feet in Room=4* 2.8/.5

check my thinking.

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**Gaby**, Thursday, December 11, 2008 at 7:03pm
16.8*2.8=47.04/5=9.4

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**Ms. Sue**, Thursday, December 11, 2008 at 7:07pm
How can the room be only 9.4 feet, when 1 inch = 8 feet?

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**Gaby**, Thursday, December 11, 2008 at 7:13pm
I set up another porportion and cross multiplied, and i got what you told me...

8ft over 1in = x over 2.8 and I crossed multiplied to get 22.4

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**Ms. Sue**, Thursday, December 11, 2008 at 7:01pm
Set up a proportion.

0.5 / 4 = 2.8 / x

Cross multiply.

0.5x = 4 * 2.8

0.5x = 11.2

x = 22.4

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