Solving Proportions

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Class:

Date:

Show your work for each problem.

1.
What method is used to solve proportions by multiplying diagonally?
1. a)Factoring
2. b)Long division
3. c)Cross multiplication
4. d)Square root
2.
Solve for :
3.
Which equation correctly shows cross multiplication for ?
1. a)
2. b)
3. c)
4. d)
4.
Solve the proportion:
5.
Solve for :
6.
If 5 apples cost 3 euros, how much do 15 apples cost?
7.
Solve for :
8.
A recipe uses 3 cups of flour for 12 cookies. How many cups are needed for 20 cookies?
1. a)4 cups
2. b)7 cups
3. c)5 cups
4. d)6 cups
9.
On a map, 4 cm represents 50 km. If two cities are 10 cm apart on the map, what is the actual distance?
10.
Solve for :
11.
What is the scale factor from the first ratio to the second in ?
1. a)5
2. b)3
3. c)4
4. d)2
12.
A car travels 180 km on 15 liters of fuel. How many liters are needed to travel 300 km?
13.
Solve for :
14.
A medicine is dosed at 5 mg per 2 kg of body weight. What dose should a 70 kg patient receive?
15.
A model car is built at a scale of 1:24. If the real car is 4.8 m long, how long is the model in cm?
1. a)24 cm
2. b)12 cm
3. c)48 cm
4. d)20 cm
16.
Using the scale factor method: If , find .