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Finding the Third Proportional to 7,920 and 12,311

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Solution

The third proportional to 7,920 and 12,311 is: 19,136.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920 : 12,311 = 12,311 : x
  2. Step 2: Convert to fraction form
    7,920/12,311 = 12,311/x
  3. Step 3: Cross multiply
    7,920x = 12,311 × 12,311
  4. Step 4: Simplify right side
    7,920x = 151,560,721
  5. Step 5: Solve for x
    x = 151,560,721/7,920
  6. Step 6: Final answer
    x = 19,136.45

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.