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Finding the Third Proportional to 21,372 and 39,480

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Solution

The third proportional to 21,372 and 39,480 is: 72,930.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,372 : 39,480 = 39,480 : x
  2. Step 2: Convert to fraction form
    21,372/39,480 = 39,480/x
  3. Step 3: Cross multiply
    21,372x = 39,480 × 39,480
  4. Step 4: Simplify right side
    21,372x = 1,558,670,400
  5. Step 5: Solve for x
    x = 1,558,670,400/21,372
  6. Step 6: Final answer
    x = 72,930.49

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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.