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Finding the Third Proportional to 20,489 and 41,730

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Solution

The third proportional to 20,489 and 41,730 is: 84,991.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,489 : 41,730 = 41,730 : x
  2. Step 2: Convert to fraction form
    20,489/41,730 = 41,730/x
  3. Step 3: Cross multiply
    20,489x = 41,730 × 41,730
  4. Step 4: Simplify right side
    20,489x = 1,741,392,900
  5. Step 5: Solve for x
    x = 1,741,392,900/20,489
  6. Step 6: Final answer
    x = 84,991.60

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Why These Related Problems?

These problems maintain the same ratio (2.04) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.