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Since the given ratios are all equivalent (1:9, 2:18, 3:27, 4:36), we can see that they all have a ratio of 1:9.
So, the missing equivalent ratios would be:
5:45
6:54
7:63
8:72
Plotting these points on the coordinate plane, they would fall on the same line as the given points, forming a straight line with a slope of 9/1.