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1605 F. Bacon Of Aduancem. Learning ii. sig. Qq1 A proportion Quintuple at most, of the writing infoulding, to the writing infoulded. View more context for this quotation

1641 J. Wilkins Mercury ix. 93 Wee may easily inscribe any secret sence in any ordinary letter, onely by a quintuple proportion of the writing.

1784 J. Keeble Theory of Harmonics ii. iv. 157 Thus it appears that the motion of a minor third in the fundamental bass has its original in the quintuple proportion.

1813 J. M. Good et al. Pantologia at Music There is also a species of time..which contains five crotchets in a bar... Tartini considered this quintuple proportion as unfit for melody, and impossible to be executed.

1867 Chambers's Information for People (new ed.) II. 261/2 ‘With a good system of agriculture,’ says M'Culloch,..‘the produce of the country might be augmented to an extent not easily imagined—perhaps in a quintuple proportion.’

1987 Jrnl. Mus. Theory 31 42 [In Rameau's system of harmony] the lower and upper seventeenth..provides the quintuple proportion (1:5:25) upon which is founded a subsidiary fundamental bass motion: the progression of thirds.