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Finding the Fourth Proportional to 8,391.11, 12,578.79 and 2,840.57

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Solution

The fourth proportional to 8,391.11, 12,578.79 and 2,840.57 is: 4,258.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,391.11 : 12,578.79 = 2,840.57 : x
  2. Step 2: Convert to fraction form
    8,391.11/12,578.79 = 2,840.57/x
  3. Step 3: Cross multiply
    8,391.11x = 12,578.79 × 2,840.57
  4. Step 4: Simplify right side
    8,391.11x = 35,730,928.44
  5. Step 5: Solve for x
    x = 35,730,928.44/8,391.11
  6. Step 6: Final answer
    x = 4,258.19

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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.