9. Find the fourth proportion of 3 and (1) 9 (3) 5.5 (2) 12 (4) 312

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g. (2) Let fourth proportional of 3 and 6 be ( x ). Then, ( 3: 6: 6: x ) [ 3 times x=6 times 6 ] ( Rightarrow ) [ x=12 ] ( therefore )

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