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Finding the Third Proportional to 11,721 and 15,658

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Solution

The third proportional to 11,721 and 15,658 is: 20,917.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,721 : 15,658 = 15,658 : x
  2. Step 2: Convert to fraction form
    11,721/15,658 = 15,658/x
  3. Step 3: Cross multiply
    11,721x = 15,658 × 15,658
  4. Step 4: Simplify right side
    11,721x = 245,172,964
  5. Step 5: Solve for x
    x = 245,172,964/11,721
  6. Step 6: Final answer
    x = 20,917.41

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.