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Finding the Third Proportional to 217.13 and 406.69

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Solution

The third proportional to 217.13 and 406.69 is: 761.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.13 : 406.69 = 406.69 : x
  2. Step 2: Convert to fraction form
    217.13/406.69 = 406.69/x
  3. Step 3: Cross multiply
    217.13x = 406.69 × 406.69
  4. Step 4: Simplify right side
    217.13x = 165,394.72
  5. Step 5: Solve for x
    x = 165,394.72/217.13
  6. Step 6: Final answer
    x = 761.75

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Why These Related Problems?

These problems maintain the same ratio (1.87) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.