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Finding the Third Proportional to 20,861 and 43,180

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Solution

The third proportional to 20,861 and 43,180 is: 89,377.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861 : 43,180 = 43,180 : x
  2. Step 2: Convert to fraction form
    20,861/43,180 = 43,180/x
  3. Step 3: Cross multiply
    20,861x = 43,180 × 43,180
  4. Step 4: Simplify right side
    20,861x = 1,864,512,400
  5. Step 5: Solve for x
    x = 1,864,512,400/20,861
  6. Step 6: Final answer
    x = 89,377.90

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Why These Related Problems?

These problems maintain the same ratio (2.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.