We need to solve for "g" in the proportion:
45/g = 5/1
we start by cross-multiplying since the inknown "g"is in the denominator:
45 * 1 = 5 * g
operate on the left
45 = 5 * g
divide bothe sides by "5" to isolate "g"
45 / 5 = g
Therefore g = 9
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