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Finding the Fourth Proportional to 235.97, 353.88 and 81.90

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Solution

The fourth proportional to 235.97, 353.88 and 81.90 is: 122.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.97 : 353.88 = 81.90 : x
  2. Step 2: Convert to fraction form
    235.97/353.88 = 81.90/x
  3. Step 3: Cross multiply
    235.97x = 353.88 × 81.90
  4. Step 4: Simplify right side
    235.97x = 28,982.77
  5. Step 5: Solve for x
    x = 28,982.77/235.97
  6. Step 6: Final answer
    x = 122.82

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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.