JSFiddle - React, Tailwind, and code Playground

JavaScript

var numbers = [3, 8, 45, 74, 123],
    ratio = Math.max.apply(this, numbers) / 100,
    l = numbers.length,
    i;

for ( i = 0; i < l; i++ ) {
    numbers[i] = Math.round( numbers[i] / ratio );
}

alert(numbers);