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Finding the Third Proportional to 9,915 and 20,457

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Solution

The third proportional to 9,915 and 20,457 is: 42,207.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,915 : 20,457 = 20,457 : x
  2. Step 2: Convert to fraction form
    9,915/20,457 = 20,457/x
  3. Step 3: Cross multiply
    9,915x = 20,457 × 20,457
  4. Step 4: Simplify right side
    9,915x = 418,488,849
  5. Step 5: Solve for x
    x = 418,488,849/9,915
  6. Step 6: Final answer
    x = 42,207.65

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Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.