In the percent proportion, the ratio of a part of something (part) to

the whole (base) is equal to the percent written as a fraction.

The part a = 4.34 

The base b = 14

Replace a with 4.34 and b with 14.

        (Means-extremes Property of proportion: If , then ad = bc.)

  (Divide each side by 14)

              (Cancel common terms)

                               (Simplify:)

4.34 is 31% of 14.