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Finding the Fourth Proportional to 8,638.92, 12,950.14 and 2,791.88

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Solution

The fourth proportional to 8,638.92, 12,950.14 and 2,791.88 is: 4,185.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,638.92 : 12,950.14 = 2,791.88 : x
  2. Step 2: Convert to fraction form
    8,638.92/12,950.14 = 2,791.88/x
  3. Step 3: Cross multiply
    8,638.92x = 12,950.14 × 2,791.88
  4. Step 4: Simplify right side
    8,638.92x = 36,155,236.86
  5. Step 5: Solve for x
    x = 36,155,236.86/8,638.92
  6. Step 6: Final answer
    x = 4,185.16

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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.