arithmetical proportion

from The Collaborative International Dictionary of English v.0.48

Arithmetical \Ar`ith*met"ic*al\, a.
   Of or pertaining to arithmetic; according to the rules or
   method of arithmetic.
   [1913 Webster]

   {Arithmetical complement of a logarithm}. See {Logarithm}.

   {Arithmetical mean}. See {Mean}.

   {Arithmetical progression}. See {Progression}.

   {Arithmetical proportion}. See {Proportion}.
      [1913 Webster]