The constant of proportionality is 2.5.
Firstly, there is proportional relationship.
Two values x and y are said to be in a proportional relationship if x=ky, where x and y are variables and k is a constant.
x = ky
The constant k is called constant of proportionality.
Given that,
A 2-column table with 3 rows.
Column 1 is labeled x with entries 2, 4, and 5.
Column 2 is labeled y with entries 5, 10, and 12.5.
Based on the above information, the calculation is as follows:
5/2 = 2.5 , so it comes 2.5
10/ 4 = 2.5 so it comes 12 and so on
Hence, The constant of proportionality is 2.5.
Learn more about proportional relationship variables here:
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