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Finding the Third Proportional to 684.25 and 1,040.38

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Solution

The third proportional to 684.25 and 1,040.38 is: 1,581.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.25 : 1,040.38 = 1,040.38 : x
  2. Step 2: Convert to fraction form
    684.25/1,040.38 = 1,040.38/x
  3. Step 3: Cross multiply
    684.25x = 1,040.38 × 1,040.38
  4. Step 4: Simplify right side
    684.25x = 1,082,380.14
  5. Step 5: Solve for x
    x = 1,082,380.14/684.25
  6. Step 6: Final answer
    x = 1,581.85

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.