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Finding the Third Proportional to 15,717 and 21,357

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Solution

The third proportional to 15,717 and 21,357 is: 29,020.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,717 : 21,357 = 21,357 : x
  2. Step 2: Convert to fraction form
    15,717/21,357 = 21,357/x
  3. Step 3: Cross multiply
    15,717x = 21,357 × 21,357
  4. Step 4: Simplify right side
    15,717x = 456,121,449
  5. Step 5: Solve for x
    x = 456,121,449/15,717
  6. Step 6: Final answer
    x = 29,020.90

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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.