2
general::
noun ADJ. high, low | male/female, pupil/teacher, etc. | benefit-to-risk, power-to-weight, etc. VERB + RATIO achieve, have They have a high ratio of imports to exports. | improve, increase The hospital is trying to improve its staff/patient ratio. | reduce | calculate, find, work out RATIO + VERB improve | worsen the worsening pupil/teacher ratio in our schools PREP. in a/the ~ We mixed the oil and water in a ratio of one to five. | ~ between the ratio between the amount of time spent on the work and the profit produced | ~ of sth to sth the ratio of house prices to incomes PHRASES in direct ratio to sth Their sales rose in direct ration to the amount they spent on advertising.
Oxford Collocations Dictionary