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Finding the Fourth Proportional to 8,591.52, 12,859.20 and 5,307.28

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Solution

The fourth proportional to 8,591.52, 12,859.20 and 5,307.28 is: 7,943.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,591.52 : 12,859.20 = 5,307.28 : x
  2. Step 2: Convert to fraction form
    8,591.52/12,859.20 = 5,307.28/x
  3. Step 3: Cross multiply
    8,591.52x = 12,859.20 × 5,307.28
  4. Step 4: Simplify right side
    8,591.52x = 68,247,374.98
  5. Step 5: Solve for x
    x = 68,247,374.98/8,591.52
  6. Step 6: Final answer
    x = 7,943.57

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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.