Thesaurarium mathematicae, or, The treasury of mathematicks containing variety of usefull practices in arithmetick, geometry, trigonometry, astronomy, geography, navigation and surveying ... to which is annexed a table of 10000 logarithms, log-sines, and log-tangents / by John Taylor.

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Title: Thesaurarium mathematicae, or, The treasury of mathematicks containing variety of usefull practices in arithmetick, geometry, trigonometry, astronomy, geography, navigation and surveying ... to which is annexed a table of 10000 logarithms, log-sines, and log-tangents / by John Taylor.
Author: Taylor, John, mathematician.
Publication: London :: Printed by J.H. for W. Freeman,; 1687.
Rights/Permissions: To the extent possible under law, the Text Creation Partnership has waived all copyright and related or neighboring rights to this keyboarded and encoded edition of the work described above, according to the terms of the CC0 1.0 Public Domain Dedication (http://creativecommons.org/publicdomain/zero/1.0/). This waiver does not extend to any page images or other supplementary files associated with this work, which may be protected by copyright or other license restrictions. Please go to http://www.textcreationpartnership.org/ for more information.
Subject terms: Mathematics -- Early works to 1800.
Link to this Item: http://name.umdl.umich.edu/a64224.0001.001
Cite this Item: "Thesaurarium mathematicae, or, The treasury of mathematicks containing variety of usefull practices in arithmetick, geometry, trigonometry, astronomy, geography, navigation and surveying ... to which is annexed a table of 10000 logarithms, log-sines, and log-tangents / by John Taylor." In the digital collection Early English Books Online. https://name.umdl.umich.edu/a64224.0001.001. University of Michigan Library Digital Collections. Accessed May 31, 2024.

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PROP. V. To two numbers given, to find out a third, fourth, fifth, sixth, &c. Numbers in a continual pro∣portion.

To operate this proportion, you must multi∣ply the second number by it self, and that pro∣duct divide by the first Term, the Quotient is a third proportional: Again you must multiply the third Term by it self, and its Quadret di∣vide by the second Term, the Quotient is a fourth proportional, and so after this manner a fifth, sixth; or as many more proportionals as you please may be found: Examp. Let it be re∣quired to find six numbers in a continual pro∣portion to one another; as 4 to 8. To operate this first according to the Rule, I multiply the second Term 8 by it self the product is 64, which divided by the first Term 4, the Quoti∣ent is 16: so is 4, 8, and 16 in a continual pro∣portion; And so observing the Rules prescribed, proceed in your operation untill you have found your six numbers in a continual propor∣tion; which in this Example will be 4, 8, 16, ••2, 64, and 128, and so will you have form'd six numbers in a continual proportion.