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3)Proportion
Example: 30/20 = 60/x Operation:
Align "30" on the outer scale with ‘20’ on the inner scale, Then, ‘60’ on the outer scale corresponds to ‘40’ on the inner scale. At this point, the proportion for every value on the inner and outer scales is 30:20.
4)Square root
Example: Square root of 225 Operation:
Turn the outer scale slowly and find a value that corresponds to both "22.5" on the outer scale and "10" on the inner scale. In this example, "22.5" on the outer scale corresponds to "15" on the inner scale, and "10" on the inner scale corresponds to "15" on the outer scale. Thus, the answer is 15.
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