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Finding the Third Proportional to 20,600 and 27,980

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Solution

The third proportional to 20,600 and 27,980 is: 38,003.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,600 : 27,980 = 27,980 : x
  2. Step 2: Convert to fraction form
    20,600/27,980 = 27,980/x
  3. Step 3: Cross multiply
    20,600x = 27,980 × 27,980
  4. Step 4: Simplify right side
    20,600x = 782,880,400
  5. Step 5: Solve for x
    x = 782,880,400/20,600
  6. Step 6: Final answer
    x = 38,003.90

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.