5-1 Objective: Solving proportions. A ratio is the comparison of two numbers written as a fraction. An equation in which two ratios are equal is called.

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Presentation transcript:

5-1 Objective: Solving proportions

A ratio is the comparison of two numbers written as a fraction. An equation in which two ratios are equal is called a proportion. A proportion can be written using colon notation like this a:b::c:d Or as the more recognizable (and useable) equivalence of two fractions.

Proportions To set up a proportion think part/whole part ______ whole = part whole If you can travel 120 miles on 6 gallons of gas, how far can you drive on 8 gallons of gas? 120miles = _____ (x) miles (8)gas (6)gas ______ 6x=960 x=160

RATIOS & PROPORTIONS Are the following proportions? FALSE – Not a proportion TRUE – this is a proportion

RATIOS & PROPORTIONS Find the missing numbers to make the following proportions. 9 10