Sesquialteral /(?)/

Ses·qui·al·ter·al

Sesquialteral

a.
  1. Once and a half times as great as another; having the ratio of one and a half to one.

Phrases & Compounds
Sesquialteral ratio
the ratio of one and a half to one; thus, 9 and 6 are in a sesquialteral ratio.