Ratio and Proportion Calculator

Ratio:

/ =

x / y = a : b

(Enter both fields above)

Proportion:

: = :

x : y = a : b

(Enter any three fields above)

Example: If it takes 20 days to build 4 motors, how long would it take to build 10 motors?
Answer:    machine : days = machine : days
                                4 : 20 = 10 : x
                                x = 50