Module 5

Module 5

1. Ratio

   • Concept
     • A Rationis a quotient of two quantities
   • Ways to express it
     • A to B, A/B or A:B
   • Example
     • 5 hours to 3 hours: the ratio of 5hr to 3 hr is 5/3.

2. Proportion

   • Concept
     • A proportion is a statement hat says that two ratiosnare equal
   • Elements
     • Terms, Extremes and Means
   • Example
     • 3/4 = 15/20
   • Cross product
     • If A/B = C/D then the cross products AD and BC are equal
   • Application
     • Predict Population

3. Variations

   • Direct
     • Concept
       • Y varies directly as X, or Y is direclty porpotional to X
     • Constant of variation
       • Y/X = K the constant K is a numerical value called the constant of variation
     • Example
   • Inverse
     • Concept
       • Y Varies inversely as X if there exists a nonzero real number K such that
     • Example
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     • Variation
       • Y varies inversely as the Nth power of X if there exists a nonzero real number K such that

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