The common factors of 32 and 48 are 1, 2, 4, 8 and 16.
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The use of the expression 'common ratio' means that the sequence is a Geometric series where the terms are of the form a, ar ar2, ar3, ...arn-1 where a is the first term and r is the common ratio. The third term, a3 = 3 x 32 = 3 x 9 = 27
ar
a, ar, ar^2 and ar^3 where a and r are constants.
( a + ar ) = a ( 1 + r )
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