The real data has been turned off to show the DISTANCES (not ratios) on the circle. These circle sizes were set because they repeat. The Arrow tool was precisely centered and used to measure them. There is a tolerance of about 1 price unit at 400 distance. They should really offer a 1:1 setting automatically. No more 1/2 circles either.
Accuracy, protractors, angles through the circles, circles with distances shown if desired. Everything set from the chart, or by ratio if desired.
These are all tools I would have customized. Also proportional boxes.. and very accurate scale settings based on pixels not bars.