Ratios & Propotions

Ratios & Propotions

1. Ratio

   • Quotent of two quantities a to b, a/b or a:b
     • Ratios are used to compare units of measure

2. Proportion

   • Is a statement that says that two ratios are equal
     • Cross Product
       • If a/b=c/d are iqual ab=bc (as long as b≠o and d≠0)
     • Direct Variation
       • y varies directly as x, or y is directly proportional to x
         • y=kx or y/x=k
           • K is a constant of variation
     • Direct Variation
       • y varies directly as x or y is directly proprtional to x
         • y=kx or y/x=k
     • Direct Variation as Power
       • y varies directly as the nTH power of x
         • y=kx power n
     • Inverse Variation
       • y varies inversely as the nTh power of x
         • y=k/x or xy=y
           • y=k/x to the n power (Inverse Variation as power