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Finding the Third Proportional to 21,978 and 29,943

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Solution

The third proportional to 21,978 and 29,943 is: 40,794.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,978 : 29,943 = 29,943 : x
  2. Step 2: Convert to fraction form
    21,978/29,943 = 29,943/x
  3. Step 3: Cross multiply
    21,978x = 29,943 × 29,943
  4. Step 4: Simplify right side
    21,978x = 896,583,249
  5. Step 5: Solve for x
    x = 896,583,249/21,978
  6. Step 6: Final answer
    x = 40,794.58

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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.