Which is an example of a proportion?

Question

aravindg · Answer

1:2 :: 2:4

anonymous · Answer

Definition of Proportion 
A proportion is an equation written in the form stating that two ratios are equivalent.
In other words, two sets of numbers are proportional if one set is a constant times the other. 

Examples of Proportion 
,  are examples of proportions. 

Solved Example on Proportion


A cardboard model of a Honda bike is part of an outdoor display. Its height is 4 ft. The actual Honda bike is 5 ft long and 2 ft high. Find the length of the model, if its dimensions are proportionate to the real bike. 
Choices: 
A. 11 ft 
B. 12 ft 
C. 9 ft 
D. 10 ft 
Correct Answer: D 
Solution: 
Step 1:   Let n be the length of Honda bike cardboard model. 
Step 2:                   [Write a proportion.] 
Step 3: n × 2 = 4 × 5         [Write the cross products.]
Step 4: n = 10                  [Simplify the expression.] 
Step 5: The length of the Honda bike cardboard model is 10 ft