Correction for the size of a Baseball (packed)
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How big is 1.50 fifths?
It's about three-and-a-half times as big as a Baseball (packed)
The size of a Baseball (packed) is about 0.434180280 fifths.
(64% packing density) (MLB rules)
Per Major League Baseball rules, a baseball must measure between about 0.266461550 fifths and 0.28928920 fifths. A major league pitcher can throw a fastball at up to 150 kph (91 mph).