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Finding the Third Proportional to 15,156 and 20,387

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Solution

The third proportional to 15,156 and 20,387 is: 27,423.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,156 : 20,387 = 20,387 : x
  2. Step 2: Convert to fraction form
    15,156/20,387 = 20,387/x
  3. Step 3: Cross multiply
    15,156x = 20,387 × 20,387
  4. Step 4: Simplify right side
    15,156x = 415,629,769
  5. Step 5: Solve for x
    x = 415,629,769/15,156
  6. Step 6: Final answer
    x = 27,423.45

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.