Is 25 to 16 proportional to 5 to 4

Yes 25 to 16 is proportional to 5 to 4.
This is because 25 can be simplified to 5 by dividing 25 by 5.
In the same way 16 can be simplified to 4 by dividing it by 4.

It results in the same proportion which is 5 to 4.

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)