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Finding the Fourth Proportional to 8,879.87, 13,317.98 and 2,639.78

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Solution

The fourth proportional to 8,879.87, 13,317.98 and 2,639.78 is: 3,959.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,879.87 : 13,317.98 = 2,639.78 : x
  2. Step 2: Convert to fraction form
    8,879.87/13,317.98 = 2,639.78/x
  3. Step 3: Cross multiply
    8,879.87x = 13,317.98 × 2,639.78
  4. Step 4: Simplify right side
    8,879.87x = 35,156,577.14
  5. Step 5: Solve for x
    x = 35,156,577.14/8,879.87
  6. Step 6: Final answer
    x = 3,959.13

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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.