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Finding the Fourth Proportional to 135.17, 203.06 and 81.10

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Solution

The fourth proportional to 135.17, 203.06 and 81.10 is: 121.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.17 : 203.06 = 81.10 : x
  2. Step 2: Convert to fraction form
    135.17/203.06 = 81.10/x
  3. Step 3: Cross multiply
    135.17x = 203.06 × 81.10
  4. Step 4: Simplify right side
    135.17x = 16,468.17
  5. Step 5: Solve for x
    x = 16,468.17/135.17
  6. Step 6: Final answer
    x = 121.83

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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.