Let $a,$ $b,$ $c$ be a three-term arithmetic series where all the terms are positive, such that $abc = 64.$  Find the smallest possible value of $b.$
Question:
Let $a,$ $b,$ $c$ be a three-term arithmetic series where all the terms are positive, such that $abc = 64.$  Find the smallest possible value of $b.$
Answer:
Let's think step by step.

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Let $a,$ $b,$ $c$ be a three-term arithmetic series where all the terms are positive, such that $abc = 64.$  Find the smallest possible value of $b.$
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