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Finding the Third Proportional to 643.38 and 929.75

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Solution

The third proportional to 643.38 and 929.75 is: 1,343.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.38 : 929.75 = 929.75 : x
  2. Step 2: Convert to fraction form
    643.38/929.75 = 929.75/x
  3. Step 3: Cross multiply
    643.38x = 929.75 × 929.75
  4. Step 4: Simplify right side
    643.38x = 864,435.06
  5. Step 5: Solve for x
    x = 864,435.06/643.38
  6. Step 6: Final answer
    x = 1,343.59

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.