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Finding the Fourth Proportional to 66,411.20, 99,616.80 and 54,891.20

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Solution

The fourth proportional to 66,411.20, 99,616.80 and 54,891.20 is: 82,336.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,411.20 : 99,616.80 = 54,891.20 : x
  2. Step 2: Convert to fraction form
    66,411.20/99,616.80 = 54,891.20/x
  3. Step 3: Cross multiply
    66,411.20x = 99,616.80 × 54,891.20
  4. Step 4: Simplify right side
    66,411.20x = 5,468,085,692.16
  5. Step 5: Solve for x
    x = 5,468,085,692.16/66,411.20
  6. Step 6: Final answer
    x = 82,336.80

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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.