His earnings are directly proportional to the number of units he sells.
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In clinical trials, hair loss was directly proportional to the rate and total amount of weight loss in people on the drugs.—Cindy Krischer Goodman, Sun Sentinel, 25 Apr. 2026 In standard batteries, size is directly proportional to charging time.—New Atlas, 4 Apr. 2026 So is observer bias, with crowd approval often directly proportional to shock value (the suffix -ussy winning in 2022; rawdog in 2024).—Literary Hub, 13 Nov. 2025 The number of women in a group is directly proportional to higher levels of collaboration.—Anita Nelson, Forbes.com, 8 Sep. 2025 See All Example Sentences for directly proportional