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Finding the Third Proportional to 7,861 and 11,487

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Solution

The third proportional to 7,861 and 11,487 is: 16,785.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,861 : 11,487 = 11,487 : x
  2. Step 2: Convert to fraction form
    7,861/11,487 = 11,487/x
  3. Step 3: Cross multiply
    7,861x = 11,487 × 11,487
  4. Step 4: Simplify right side
    7,861x = 131,951,169
  5. Step 5: Solve for x
    x = 131,951,169/7,861
  6. Step 6: Final answer
    x = 16,785.54

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.