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  • What is it for: Calculates the value of a variable in a proportion.

  • How it works: Uses the equality relation between two ratios to solve for the unknown value.

  • Calculation: The proportion formula is used to determine an unknown value in a fraction.

  • Usage: Useful for solving percentage, scale, and comparison problems.

  • Formula: a/b = c/d → x = (b * c) / a

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