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Finding the Fourth Proportional to 133.92, 200.88 and 90.61

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Solution

The fourth proportional to 133.92, 200.88 and 90.61 is: 135.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.92 : 200.88 = 90.61 : x
  2. Step 2: Convert to fraction form
    133.92/200.88 = 90.61/x
  3. Step 3: Cross multiply
    133.92x = 200.88 × 90.61
  4. Step 4: Simplify right side
    133.92x = 18,201.23
  5. Step 5: Solve for x
    x = 18,201.23/133.92
  6. Step 6: Final answer
    x = 135.91

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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.