8th Grade Math HW! Help please

Using each of the following scales, find the dimensions in a blueprint of an 8ft-by-12ft room.
1) 1 in; 2ft
2) 1 in; 4 ft

Not sure what to do?? :o

1.) 2 ft. is to 1 in. as 8 ft. is to how many ins.?

2 / 1 = 8 / x
2x = 8(1) ............ (Cross multiply)
2x = 8
x = 8 / 2
x = 4
¨¨¨¨¨¨

2 ft. is to 1 in. as 12 ft. is to how many ins.?

2 / 1 = 12 / y
2y = 12
y = 12 / 2
y = 6
¨¨¨¨¨¨¨

Dimensions: 4 in. x 6 in.
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4 ft. is to 1 in. as 8 ft. is to how many ins.?

2.) 4 / 1 = 8 / x
4x = 8
x = 8 / 4
x = 2
¨¨¨¨¨¨¨

4 ft. is to 1 in. as 12 ft. is to how many ins.?

4 / 1 = 12 / y
4y = 12
y = 12 / 4
y = 3
¨¨¨¨¨¨¨
Dimensions: 2 in. x 3 in.
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
 

8 ft x 12 ft
so,
1) for every 2ft, that's 1 inch
8 divided by 2 is 4
12 divided by 2 is 6
the answer is 4in by 6in

2)same thing but for every 4ft, that's 1 inch
8 divided by 4 is 2
12 divided by 4 is 3
the answer is 2in by 3in