One possible answer is 1212/707.
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Well, honey, a proportion is formed when two ratios are equal. So, to find the missing number that forms a proportion with 12 and 7, you simply divide 12 by 7 to get approximately 1.714. There you go, math made sassy!
280:120, for one.
120 to 180 is an equivalent ratio.
To find the ratio of 3 weeks to 12 days, we need to convert both time periods to the same unit. Since 1 week is equal to 7 days, 3 weeks is equivalent to 3 * 7 = 21 days. Therefore, the ratio of 3 weeks to 12 days is 21:12, which simplifies to 7:4.
Try multiplying the ratio (7:12) by 1 in several different forms. (Remember, 1=1:1=2:2 etc...)