1. 6.2 Proportion Properties November 15, 2012
Bellwork
Solve the proportions.
1. 3 6
­­ = ­­­ 2. 1 3
­­­­ = ­­­
8 x+1 15 s+8 36 4
3. Simplify the Ratio.
1200cm : 1.8m 20:3
4. Find the Geometric Mean of 42 & 12.
22.45
5. The area of a rectangle is 720 in 2
. If the ratio of the length to width is 5:4,
find the perimeter of the rectangle.
108 in.
Nov 24­7:38 AM
HW pg. 367 #4­18 evens, 22 1

2. 6.2 Proportion Properties November 15, 2012
6.2 Proportions
Reciprocal Property: If 2 ratios are =, then their reciprocals are =.
If ­ = ­ then b d
a c,
­ = ­
b d a c
Interchange the means: If a c, then a b
­ = ­ ­ = ­
b d c d
Adding denominator to numerator: If a c, then a+b c+d
­ = ­ ­­­ = ­­­
b d b d
Nov 24­7:38 AM
HW pg. 367 #4­18 evens, 22 2

3. 6.2 Proportion Properties November 15, 2012
Nov 24­7:51 AM
HW pg. 367 #4­18 evens, 22 3

4. 6.2 Proportion Properties November 15, 2012
Scale Drawing: same shape as object it represents
Scale: ratio that describes how the dimensions in the drawing are related to
the actual dimensions of the object.
Nov 24­7:53 AM
HW pg. 367 #4­18 evens, 22 4

5. 6.2 Proportion Properties November 15, 2012
Nov 24­7:56 AM
HW pg. 367 #4­18 evens, 22 5

6. 6.2 Proportion Properties November 15, 2012
Nov 24­11:41 AM
HW pg. 367 #4­18 evens, 22 6

7. 6.2 Proportion Properties November 15, 2012
HW pg. 367 #4-18 evens & 22
Nov 29­8:33 AM
HW pg. 367 #4­18 evens, 22 7