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Finding the Third Proportional to 15,690 and 22,311

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Solution

The third proportional to 15,690 and 22,311 is: 31,725.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,690 : 22,311 = 22,311 : x
  2. Step 2: Convert to fraction form
    15,690/22,311 = 22,311/x
  3. Step 3: Cross multiply
    15,690x = 22,311 × 22,311
  4. Step 4: Simplify right side
    15,690x = 497,780,721
  5. Step 5: Solve for x
    x = 497,780,721/15,690
  6. Step 6: Final answer
    x = 31,725.99

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.