Closes Numerical Match

I have a list of orders in my data with Quantity. Want to do a lookup against tables like these without writing formulas to keep it dynamic. How do I find the closest match or check that it is in range? Find/replace only works for text fields.

For example, if my Q in data is 1600 then my price should return as $47. Thank you.

Price Qty
83 300
63 500
56 700
52 1000
49 1500
47 2000
45 3000
45 4000
43 50000
41 75000