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Finding the Third Proportional to 15,427 and 20,905

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Solution

The third proportional to 15,427 and 20,905 is: 28,328.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,427 : 20,905 = 20,905 : x
  2. Step 2: Convert to fraction form
    15,427/20,905 = 20,905/x
  3. Step 3: Cross multiply
    15,427x = 20,905 × 20,905
  4. Step 4: Simplify right side
    15,427x = 437,019,025
  5. Step 5: Solve for x
    x = 437,019,025/15,427
  6. Step 6: Final answer
    x = 28,328.19

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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.