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Finding the Fourth Proportional to 81,616.80, 122,425.20 and 48,439.20

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Solution

The fourth proportional to 81,616.80, 122,425.20 and 48,439.20 is: 72,658.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,616.80 : 122,425.20 = 48,439.20 : x
  2. Step 2: Convert to fraction form
    81,616.80/122,425.20 = 48,439.20/x
  3. Step 3: Cross multiply
    81,616.80x = 122,425.20 × 48,439.20
  4. Step 4: Simplify right side
    81,616.80x = 5,930,178,747.84
  5. Step 5: Solve for x
    x = 5,930,178,747.84/81,616.80
  6. Step 6: Final answer
    x = 72,658.80

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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.