The constant proportionality of the data is 5.
The definition of the constant proportionality is the ratio of two proportional values at a constant value. So, the formula for it is
C = Y / X
Where C is the constant of proportionality and X is a variable directly dependent on Y and Y is a variable directly dependent on X.
If we take the first row, then the value of x = 1 and y = 5
So, the value of C is,
C = 5/1 =5
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