1. Lesson 2­6.notebook September 12, 2013
Lesson 2.6:
*ratio ­ a comparison of 2 numbers by division
[x to y x:y x/y]
*proportion ­ an equation stating that 2 ratios are equal
*means ­ the middle terms of the proportion
2:5 = 4:7
*extremes ­ the first and last terms of the proportion
*FYI...in a proportion, the product of the extremes is equal to the product
of the means

2. Lesson 2­6.notebook September 12, 2013
*FYI...We can use "cross products" to solve proportions
[McDonald arches]
*rate ­ the ratio of 2 measurements having different units of measure
*unit rate ­ a rate that tells how many of one item is being compared to 1 of
another item
*scale ­ used when making a model of something that is too large or too
small to be convenient at actual size
*scale model ­ a 3­D reproduction of an item that has been reduced or
increased in size proportionally

3. Lesson 2­6.notebook September 12, 2013
Lesson 2.6 examples:
Determine whether the pair of ratios form a proportion. Write yes or no.
A) 3/7, 9/14
B) 2.8/4.4, 1.4/2.1
Solve each proportion. If necessary, round to the nearest hundredth.
C) n 6
9 27

4. Lesson 2­6.notebook September 12, 2013
D) 7 m
10 14
E) x ­ 3 6
5 10=

5. Lesson 2­6.notebook September 12, 2013
F) 4x + 7 6x + 2
15 10
G) Julie ran the first 6 miles in 58 minutes. If she is able to maintain the same
pace, how long will it take her to finish the 26.2 mile marathon?