MATCH closest result based upon three criteria

[racer500]

I have actual results of the calculated percentage that I wish to match to a table that three criteria, one of which is textract the closest result to the actual results

Example

Sales 47.53 Sales tax 3.27 (6.875% tax rate)

the calculated percentage (3.27/47.53) is .068799

the other criteria I wish to match is the city name, and the five digit zip code

I have a table that has three columns ZIP, CITY_NAME and TAX_RATE

I wish to provide zip, city name and the calculated percentage and find the TAX RATE that closest matches the calculated rate