user: Question: What is the largest ration with an ordinary value of 84 zolotnik?
Columns: ['Unit', 'Russian', 'Translation', 'Ratio', 'Metric value', 'Avoirdupois value', 'Ordinary value']
Types: ['text', 'text', 'text', 'real', 'text', 'text', 'text']
Sample row: ['gran', 'гран', 'grain', 1.0, '62.210 mg', '0.96004 gr.', '1.4 dolia']
SQL:

assistant: SELECT MAX("Ratio") FROM "Table" WHERE "Ordinary value" = '84 zolotnik';