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Finding the Third Proportional to 15,495 and 21,561

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Solution

The third proportional to 15,495 and 21,561 is: 30,001.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,495 : 21,561 = 21,561 : x
  2. Step 2: Convert to fraction form
    15,495/21,561 = 21,561/x
  3. Step 3: Cross multiply
    15,495x = 21,561 × 21,561
  4. Step 4: Simplify right side
    15,495x = 464,876,721
  5. Step 5: Solve for x
    x = 464,876,721/15,495
  6. Step 6: Final answer
    x = 30,001.72

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.