Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the largest ration with an ordinary value of 84 zolotnik?

### Inputs:
table_name: table, columns: ['Unit', 'Russian', 'Translation', 'Ratio', 'Metric value', 'Avoirdupois value', 'Ordinary value']

### Response:
SELECT MAX Ratio FROM table WHERE Ordinary value = 84 zolotnik