Question

Which value is equivalent to 7.2 kilograms?

Answer 1

"Equivalent" is not the right term.
"Equal" is the right one, as in "1 kilogramme" equals "1000 grammes"

Answer 2

According to,
http://www.merriam-webster.com/dictionary/equivalent
It can be used in the same sense in this case

Answer 3

I thought this was also interesting to read, http://mathforum.org/library/drmath/view/73189.html