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Finding the Third Proportional to 19,215 and 39,387

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Solution

The third proportional to 19,215 and 39,387 is: 80,735.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,215 : 39,387 = 39,387 : x
  2. Step 2: Convert to fraction form
    19,215/39,387 = 39,387/x
  3. Step 3: Cross multiply
    19,215x = 39,387 × 39,387
  4. Step 4: Simplify right side
    19,215x = 1,551,335,769
  5. Step 5: Solve for x
    x = 1,551,335,769/19,215
  6. Step 6: Final answer
    x = 80,735.66

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Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.