Yes, 20 : 4 and 30 : 6 form a proportion.
What is Proportion?
It is the relation between two ratios, whether they are equal or not.
Representation of a proportion:
a : b :: c : d
(Note that ratios can be written in terms of fraction)
[tex]\frac{a}{b}[/tex] = [tex]\frac{c}{d}[/tex] (proportion equation)
In our given problem,
20 : 4 = [tex]\frac{20}{4}[/tex] = 5
and similarly,
30 : 6 = [tex]\frac{30}{6}[/tex] = 5
The relation between both the ratios is, they are equal.
Hence they satisfices proportional equation and therefore 20 : 4 and 30 : 6 form a proportion.
To learn more about Proportion, refer to the link:
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