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Finding the Third Proportional to 7,389 and 11,691

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Solution

The third proportional to 7,389 and 11,691 is: 18,497.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,389 : 11,691 = 11,691 : x
  2. Step 2: Convert to fraction form
    7,389/11,691 = 11,691/x
  3. Step 3: Cross multiply
    7,389x = 11,691 × 11,691
  4. Step 4: Simplify right side
    7,389x = 136,679,481
  5. Step 5: Solve for x
    x = 136,679,481/7,389
  6. Step 6: Final answer
    x = 18,497.70

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.