Qlik Map Function - Size bubble by inverse number

[ajpark]

Hi Qlik Community, 

Trying to size bubbles by distance measurements. I want the bubble size to be largest for the smallest number, and smallest for the largest. 

For example:

1.1km from building A

2.5km from building A

7.6km from Building A

Aiming to have the 1.1km bubble be largest, and 7.6km the smallest.

Thanks!