Proportion Calculator
Solve proportions a/b = c/d. Enter any three values and find the missing fourth value. Cross multiply and solve instantly.
Missing Value (d)
12.000000
3/4 = 9/12
a/b
0.750000
c/d
0.750000
Cross Product (a×d = b×c)
36.00
Solve proportions a/b = c/d. Enter any three values and find the missing fourth value. Cross multiply and solve instantly.
Missing Value (d)
12.000000
3/4 = 9/12
a/b
0.750000
c/d
0.750000
Cross Product (a×d = b×c)
36.00