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Finding the Fourth Proportional to 134.75, 201.92 and 80.61

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Solution

The fourth proportional to 134.75, 201.92 and 80.61 is: 120.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.75 : 201.92 = 80.61 : x
  2. Step 2: Convert to fraction form
    134.75/201.92 = 80.61/x
  3. Step 3: Cross multiply
    134.75x = 201.92 × 80.61
  4. Step 4: Simplify right side
    134.75x = 16,276.37
  5. Step 5: Solve for x
    x = 16,276.37/134.75
  6. Step 6: Final answer
    x = 120.79

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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.