Finding an original number from a percentage increase

[Cannate]

Hello,

I'm struggling with this problem and I'm not sure where I'm going wrong.

A steam line will increase in length by 1.040% when heated. Determine the original length of the line, if it increased in length by 5.400 cm when heated.

I thought it would be as below but I'm not getting the right answer.

Percentage increase= (difference of old and new/old)x100
Transposed it would be old= 101.04/540?

Anyone tell me where I'm going wrong?

Thanks

 

[limiTS]

x=original length

[imath]0.01040x=5.400[/imath]

 

[Cannate]

x=original length

[imath]0.01040x=5.400[/imath]

Thanks! I was way out to lunch. Now I understand!