The best replacement for ratio is proportion.

The best alternatives to ratio are rated as following:
★★★★★  proportion
★★★★  interval
★★★★  rate
★★★  percentage
★★  fraction
★★  relative risk
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★★  octane
★  dynamic contrast ratio
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★  acid test
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★  net expense ratio
★  rpm
★  dilution
  rate as a fraction
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  dry basil to fresh
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  wide ratio
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  compression

Your alternative for ratio is not listed? Suggest!
Speaking about ratio, one probably shouldn't forget about industry ratio.

Other search terms related to ratio and their ratings are:
★★★★★ industry ratio
★★★★ resize
★★★ cropping
You have in mind a companion for ratio and it is not yet here? Propose!



Google Trends

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ratio
proportion
interval