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Finding the Fourth Proportional to 135.72, 203.85 and 84.39

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Solution

The fourth proportional to 135.72, 203.85 and 84.39 is: 126.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.72 : 203.85 = 84.39 : x
  2. Step 2: Convert to fraction form
    135.72/203.85 = 84.39/x
  3. Step 3: Cross multiply
    135.72x = 203.85 × 84.39
  4. Step 4: Simplify right side
    135.72x = 17,202.90
  5. Step 5: Solve for x
    x = 17,202.90/135.72
  6. Step 6: Final answer
    x = 126.75

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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.