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Finding the Fourth Proportional to 8,881, 12,255.78 and 5,155

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Solution

The fourth proportional to 8,881, 12,255.78 and 5,155 is: 7,113.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,881 : 12,255.78 = 5,155 : x
  2. Step 2: Convert to fraction form
    8,881/12,255.78 = 5,155/x
  3. Step 3: Cross multiply
    8,881x = 12,255.78 × 5,155
  4. Step 4: Simplify right side
    8,881x = 63,178,545.90
  5. Step 5: Solve for x
    x = 63,178,545.90/8,881
  6. Step 6: Final answer
    x = 7,113.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.