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In the United States, "one-to-one ratio" is preferred. A pronunciation of "ratio" is given at the following.

https://www.youtube.com/watch?v=_yVnFCNMchA

In addition, The American Heritage Dictionary, Second College Edition, 1976, shows both a two-syllable and three-syllable pronunciation for ratio.

In the United States, "one-to-one ratio" is preferred. A pronunciation of "ratio" is given at the following.

https://www.youtube.com/watch?v=_yVnFCNMchA

In addition, The American Heritage Dictionary shows both a two-syllable and three-syllable pronunciation for ratio.

https://www.ahdictionary.com/word/search.html?q=ratio

In the United States, "one-to-one ratio" is preferred. A pronunciation of "ratio" is given at the following.

https://www.youtube.com/watch?v=_yVnFCNMchA

The American Heritage Dictionary, Second College Edition, 1976, shows both a two-syllable and three-syllable pronunciation for ratio.

In the United States, "one-to-one ratio" is preferred. A pronunciation of "ratio" is given at the following.

https://www.youtube.com/watch?v=_yVnFCNMchA

In addition, The American Heritage Dictionary, Second College Edition, 1976, shows both a two-syllable and three-syllable pronunciation for ratio.

In the United States, "one-to-one ratio" is preferred. The best pronunciation of "ratio" is given at the following.

https://www.youtube.com/watch?v=_yVnFCNMchA

Ratio, pronounced correctly, consists of two syllables. Many sources give a three-syllable mispronunciation based on a widespread regional corruption.

In the United States, "one-to-one ratio" is preferred. A pronunciation of "ratio" is given at the following.

https://www.youtube.com/watch?v=_yVnFCNMchA

The American Heritage Dictionary, Second College Edition, 1976, shows both a two-syllable and three-syllable pronunciation for ratio.