a challenge question - who dares?

Hello,

My first every post (Hi), I have a quick one... here it comes...(Smirk)

if we divide 5000 over 1250 we will get the whole integer number "4". (Talking)

if we multiply 5000 by 3.68 we will get the whole integer number "18400". (Surprised)

Now, if we divide 15000 over 1250 we will get the whole integer number "12"

then when we multiply 15000 by 3.68 we will definitely get a whole integer number, in this case 55200

Now the question is: what is the relation between the multiplied number (in our case 3.68) and the divided by number (in our case 1250) in which if we change the first number we change the second number and the result is always an integer whole number in both cases.

does it make sense? (Sleepy)