 A comparison of two quantities  Often expressed as a fraction.

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Presentation transcript:

 A comparison of two quantities  Often expressed as a fraction

 The ratio of the age of a 34 year old parent to that of a 10 year old child is 34 to 10  Also can be written as:  34: 10   3.4

 An equation that states that two ratios are equal  Examples:

 To solve proportions, we will cross multiply

 Example:

The property tax on a house is $8 per $1000 assessed valuation. What is the tax on a house assessed at $165,000?

A certain car can travel 180 miles on 8 gallons of gasoline. How far can this car travel on 19 gallons of gasoline?

The scale on a map says that 0.5 cm represents 25 km. On the map the measurement between two cities is 5 cm. What is the actual distance between the cities?

Pg. 150 #’s 2 – 16 even;