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Finding the Fourth Proportional to 6,515.88, 8,990.78 and 3,863.94

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Solution

The fourth proportional to 6,515.88, 8,990.78 and 3,863.94 is: 5,331.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,515.88 : 8,990.78 = 3,863.94 : x
  2. Step 2: Convert to fraction form
    6,515.88/8,990.78 = 3,863.94/x
  3. Step 3: Cross multiply
    6,515.88x = 8,990.78 × 3,863.94
  4. Step 4: Simplify right side
    6,515.88x = 34,739,815.15
  5. Step 5: Solve for x
    x = 34,739,815.15/6,515.88
  6. Step 6: Final answer
    x = 5,331.56

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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.