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Finding the Fourth Proportional to 8,640.80, 12,951.60 and 4,479.20

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Solution

The fourth proportional to 8,640.80, 12,951.60 and 4,479.20 is: 6,713.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,640.80 : 12,951.60 = 4,479.20 : x
  2. Step 2: Convert to fraction form
    8,640.80/12,951.60 = 4,479.20/x
  3. Step 3: Cross multiply
    8,640.80x = 12,951.60 × 4,479.20
  4. Step 4: Simplify right side
    8,640.80x = 58,012,806.72
  5. Step 5: Solve for x
    x = 58,012,806.72/8,640.80
  6. Step 6: Final answer
    x = 6,713.82

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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.