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Finding the Third Proportional to 7,881 and 12,165

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Solution

The third proportional to 7,881 and 12,165 is: 18,777.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,881 : 12,165 = 12,165 : x
  2. Step 2: Convert to fraction form
    7,881/12,165 = 12,165/x
  3. Step 3: Cross multiply
    7,881x = 12,165 × 12,165
  4. Step 4: Simplify right side
    7,881x = 147,987,225
  5. Step 5: Solve for x
    x = 147,987,225/7,881
  6. Step 6: Final answer
    x = 18,777.72

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.