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The Indirect Rule of Three.

Is performed the same as in vulgar arithmetick after the numbers are prepared as taught in Decimals.

If when the Bushell of Weight is: 6s:8d a Penny Loaf weighs 5 1/2 ounces, what will it weigh when wheat is 10s per bushel?  

6s:8d  :  5 1/2 oz : : 10s

12 |8.00 2|1.0   2/0 |10
    -----   ---        ---
2/0|6.6666|5.5         .5
     ---------
     .33333
         55
     ------
     166665
    166665
    -------
  .5|1.833315
    ----------
    oz 3.66663
            16
         -----
  Dr. 10.66608