239.36% is the change from 188 to 638
Calculation steps:
[( 638 - 188 ) ÷ 188] x 100 = 239.36%
Formula
Percentage change = [(638 - 188) / 188] x 100
Subtract the new number by the original number
638 - 188 = 450
450 ÷ 188 = 2.393617021276596
2.393617021276596 x 100 = 239.36%