7.1 and 7.2 Ratios and Proportions

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7.1 and 7.2Ratios and Proportions
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Ratio

• Comparison of 2 or more things

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Expressed in 3 ways

• Quotient using a division sign
• Fraction
• Ratio using a colon ( )

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• Make sure they are in simplest form!
• Always be sure to reduce!

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To write the ratio of 2 quantities of different
units

• Express the measures in the same unit (convert
  bigger unit to smaller unit)
• Write and simplify the ratio

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Proportion

• An equation that states two equal ratios
• ab cd a is to b as c is to d

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Means and Extremes

• Extremes 1st and 4th terms
• Ex a, d
• Means 2nd and 3rd terms
• Ex. b, c

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Means/Extremes Property

• Product of the means equals the product of the
  extremes
• Cross-Multiplication Property