We have: 6:11 = 12 :x. Here, x is the fourth proportional we are seeking. To find the value of x, we cross multiply like this: 6*x = 11*12 x = (11 * 12)/ 6 x = 22 Fourth proportion to 6, 11 and 12 = 22 The correct answer is(D) 22.
Hello,
The fourth proportional of 6, 11, and 12 can be found by the determination of a number which is needed to keep proportion among those three numbers. More directly, if three numbers exist (6, 11, and 12), the fourth proportional x is sought such that the ratio between 6 and 11 is equal to the ratio between 12 and x.
This means that for this specific problem, the value for the fourth proportion is 22. What that means is that, in this case, when you do the calculation, 6 is to 11 as 12 is to 22. Then, if you select choice (D), 22, it will maintain correctly the proportion between these values. Such problems are the usual ones in mathematics used to test understanding of ratios and proportions.
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