sesquialterate

Etymology
From + English, from  +.

Adjective

 * 1)  In a ratio of 3 to 2 or 1½ times to 1.
 * 9 and 6 are in a sesquialterate ratio.
 * 1) * 1818, Iamblichus, Life of Pythagoras Tr. Thomas Taylor (page 328)
 * the ratio of 3 to 2, which is sesquialter, forms the symphony diapente
 * 1) * 1888, Sir Isaac Newton, Portsmouth Collection of Books and Papers Written or Belonging to Sir Isaac Newton (page xviii)
 * from Kepler's Rule of the periodical times of the Planets being in a sesquialterate proportion of their distances from the centers of their orbs I deduced
 * from Kepler's Rule of the periodical times of the Planets being in a sesquialterate proportion of their distances from the centers of their orbs I deduced