I am assuming you want parts mixed 5:1, the base being a fluid.
What ever part 1 is, use 5 x that amount to get 5:
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5 half gallons to 1 half gallon
5/2 = 2 1/2
25/6 but its a improper number so 25/6 simplified into a mix number is 4 1/6
Divide the remainder by the divisor. Example: 5 / 2 = 2 and 1/2.
550% = 5.5 or 11/2 = 5 1/2