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Finding the Third Proportional to 21,408 and 39,648

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Solution

The third proportional to 21,408 and 39,648 is: 73,428.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,408 : 39,648 = 39,648 : x
  2. Step 2: Convert to fraction form
    21,408/39,648 = 39,648/x
  3. Step 3: Cross multiply
    21,408x = 39,648 × 39,648
  4. Step 4: Simplify right side
    21,408x = 1,571,963,904
  5. Step 5: Solve for x
    x = 1,571,963,904/21,408
  6. Step 6: Final answer
    x = 73,428.81

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Why These Related Problems?

These problems maintain the same ratio (1.85) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.