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You can use the formula for the area of a circle to compare (i.e., divide) the areas.
15 people would fit in a van. 45(number of people) divided by 3(the number of vans) equals 15
9 people
80 to 135 people
You always use some model (i.e. function) to fit experimental curve. If you do not know the kind of curve (linear, parabola, Gauss, etc.) you can try to fit with different functions and then compare the residual sum of squares and coefficient of determination of those fit functions. I use MagicPlot for curve fitting, you can try to find something in MagicPlot on-line help.