Answer. By adding the proportionality constant .
Explanation:
suppose 'x' a is directly proportional to the 'y' , where x and y are variables:
x ∝ y
with an input of constant value 'K' proportionality relation gets converted into an equation:
x = K y
For example : Gravitational force is directly proportional to the product of two masses and inversely proportional to the square of the distance between the two masses.
F ∝ [tex]\frac {m_1m_2}{r^{2}}[/tex]
To convert this proportionality relation constant 'G' was introduced known as gravitational constant whose value remains constant under every conditions.
[tex]F=\frac {G\times m_1m_2}{r^{2}}[/tex]
[tex]G=6.67408\times 10^{-11}m^3Kg^{-1}s^{-2}[/tex]
