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Finding the Fourth Proportional to 8,663.72, 12,992.13 and 3,115.35

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Solution

The fourth proportional to 8,663.72, 12,992.13 and 3,115.35 is: 4,671.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,663.72 : 12,992.13 = 3,115.35 : x
  2. Step 2: Convert to fraction form
    8,663.72/12,992.13 = 3,115.35/x
  3. Step 3: Cross multiply
    8,663.72x = 12,992.13 × 3,115.35
  4. Step 4: Simplify right side
    8,663.72x = 40,475,032.20
  5. Step 5: Solve for x
    x = 40,475,032.20/8,663.72
  6. Step 6: Final answer
    x = 4,671.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.