Help me extract a formula from data

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I have the following datapoints, and I need a formula to describe the relationship between them:

╔═══╦═════╦═══════════════╦═════════════════════╦═════════╦
║   ║ A   ║      B        ║           C         ║  db(C)  ║
╠═══╬═════╬═══════════════╬═════════════════════╬═════════║
║ 1 ║ 70  ║ 0.3000000     ║ 1.58489319246111    ║ 2       ║         
║ 2 ║ 40  ║ 0.0300000     ║ 2.51188643150958    ║ 4       ║         
║ 3 ║ 1   ║ 0.0000010     ║ 3.98107170553497    ║ 6       ║         
║ 4 ║ 90  ║ 0.2000000     ║ 3.98107170553497    ║ 6       ║         
║ 5 ║ 0.05║ 0.0000000001  ║ 6.30957344480193    ║ 8       ║         
║ 6 ║ 2   ║ 0.0000001     ║ 6.30957344480193    ║ 8       ║         
║ 7 ║ 98  ║ 0.0010000     ║ 15.8489319246111    ║ 12      ║         
╚═══╩═════╩═══════════════╩═════════════════════╩═════════╩

On each row the formula is the same, if not then it's my fault I have mistyped the values, but normally it should be the same.

The 4th column is the decibel 10*log_10(x) value of the C column, notice the pattern there. The formula is a physics formula involving S/N ratio, but I can't find it so it has to be extracted from here.

I would like a formula that would describe the relationship between A,B,C , it is the same formula on each row, it should be not that hard to extract.