Answer:
4/5 forms a proportion with 16/20.
Explanation:
We are given an rational number as 16/20.
we have to find another rational number which is equivalent to it.
as both 16 and 20 are multiple of 4 we could also represent the ratio 16/20 as:

we cancel 4 on both the numerator and denominator to get
.
Hence, the ratio
is proportion with
.