SOLUTION: Which one of the following statements expresses a true proportion? 1. 2:3 = 3:2 2. 14:6 = 28:18 3. 3:5 = 12:20 4. 42:7 = 6:2

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: Which one of the following statements expresses a true proportion? 1. 2:3 = 3:2 2. 14:6 = 28:18 3. 3:5 = 12:20 4. 42:7 = 6:2       Log On


   

Question 175111: Which one of the following statements expresses a true proportion? 1. 2:3 = 3:2
2. 14:6 = 28:18
3. 3:5 = 12:20
4. 42:7 = 6:2
Answer by Alan3354(69443) About Me  (Show Source):
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Which one of the following statements expresses a true proportion? 1. 2:3 = 3:2
2. 14:6 = 28:18
3. 3:5 = 12:20
4. 42:7 = 6:2
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Only #3 does.
Multiply the outsides by the insides (means times extremes). They have to be equal if it's a proportion.
For #3, 3*20 = 5*12