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The same mathematics applies when we wish to enlarge.Depicting something in the scale of 2:1 all measurements then become twice as large as in reality.The cross products of a proportion is always equal If we again use the example with the cookie mix used above $$\frac=\frac$$ $$\cdot =\cdot =40$$ It is said that in a proportion if $$\frac=\frac \: where\: y,w\neq 0$$ $$xw=yz$$ If you look at a map it always tells you in one of the corners that 1 inch of the map correspond to a much bigger distance in reality. We often use scaling in order to depict various objects. Thus any measurement we see in the model would be 1/4 of the real measurement.
These can then be solved by cross multiplying to find each missing variable.
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An example of a ratio word problem is: "In a bag of candy, there is a ratio of red to green candies of 3:4.
If the bag contains 120 pieces of candy, how many red candies are there?