Rudimentary Treatise On Mensuration ...: Arranged for the Use of Schools And ...
Rudimentary Treatise On Mensuration ...: Arranged for the Use of Schools And ...
Baker Thomas Fl.
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Also the mean between 29 and 320 is 96*3. And the mean between 71 and 274 is 139. Problem. VI. To find a third proportional to two numbers. Suppose to 21 and 32. — Set the first 21 on B to the second 32 on A ; then against the second 32 on B stands 48*8 on A ; which is the third proportional sought. Also the third proportional to 17 and 29 is 49*4. And the third proportional to 73 and 14 is 2'5. Problem VII. To find a fourth proportional to three numbers : or, to per- form the Rule-of Three. Su...ppose to find a fourth proportional to 12, 28, and 114. — Set the first term 12 on B to the second term 28 on A ; then against the third term 114 on B, stands 266 on A, which is the fourth proportional sought. Also the fourth proportional to 6, 14, 29, is 67*6. And the fourth proportional to 27, 20, 73, is 54*0. . TIMBER MEASURING. Problem I. To find the area^ or superficial content^ of a board or plank. Multiply the length by the mean breadth. Note. When the board is tapering, add the breadth at the two ends together , and take half the sum for the mean breadth.
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