Given,
[tex]\frac{4}{9}\text{ and }\frac{14}{19}[/tex]
It is the simplest form.
So, option a is not proportional.
b)
[tex]\frac{27}{81}=\frac{21}{72}[/tex]
The simplest form of the expression is,
[tex]\frac{3}{9}=\frac{7}{24}[/tex]
The simplest form is not equal
So, option b is not proportional.
c)
[tex]\frac{30}{36}=\frac{40}{46}[/tex]
The simplest form of the expression is,
[tex]\frac{5}{6}=\frac{20}{23}[/tex]
The simplest form is not equal
So, option c is not proportional.
d)
[tex]\frac{40}{48}=\frac{100}{120}[/tex]
The simplest form of the expression is,
[tex]\frac{20}{24}=\frac{20}{24}[/tex]
The simplest form is equal
So, option d is proportional.
Hence, the correct option is (d).
