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Finding the Fourth Proportional to 135.90, 203.34 and 80.85

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Solution

The fourth proportional to 135.90, 203.34 and 80.85 is: 120.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.90 : 203.34 = 80.85 : x
  2. Step 2: Convert to fraction form
    135.90/203.34 = 80.85/x
  3. Step 3: Cross multiply
    135.90x = 203.34 × 80.85
  4. Step 4: Simplify right side
    135.90x = 16,440.50
  5. Step 5: Solve for x
    x = 16,440.50/135.90
  6. Step 6: Final answer
    x = 120.97

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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.