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Finding the Third Proportional to 9,900 and 20,909

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Solution

The third proportional to 9,900 and 20,909 is: 44,160.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,900 : 20,909 = 20,909 : x
  2. Step 2: Convert to fraction form
    9,900/20,909 = 20,909/x
  3. Step 3: Cross multiply
    9,900x = 20,909 × 20,909
  4. Step 4: Simplify right side
    9,900x = 437,186,281
  5. Step 5: Solve for x
    x = 437,186,281/9,900
  6. Step 6: Final answer
    x = 44,160.23

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.