Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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Geometric Sequences - Problem 11

Alissa Fong
Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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Finding missing terms in a geometric number pattern, or sequence, is the same idea as finding a specific geometric mean. You first write an equation by finding how many times r, the ratio, will be multiplied by the first known term in order to arrive at the second known term. When you solve for r, be extremely careful if you're using an even root- that means there are two possible r values, and two possible sequences that you need to address. Once you know r, you can multiply your first known term by that r in order to arrive at your missing term.

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