I would look to create a point map in Tableau.
So you will either need geographical data, a spatial file or data with associated latitude and longitude fields.
The use your measure on the Size mark to get the different sized circles - remember you can change the range of sizes by selecting 'edit sizes' on the dropdown of the legend.
The different colours come from a dimension, make sure they are ordered with the smallest at the top.
See attached example.
example.twbx 2.2 MB