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Finding the Fourth Proportional to 135.78, 187.41 and 129.27

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Solution

The fourth proportional to 135.78, 187.41 and 129.27 is: 178.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.78 : 187.41 = 129.27 : x
  2. Step 2: Convert to fraction form
    135.78/187.41 = 129.27/x
  3. Step 3: Cross multiply
    135.78x = 187.41 × 129.27
  4. Step 4: Simplify right side
    135.78x = 24,226.49
  5. Step 5: Solve for x
    x = 24,226.49/135.78
  6. Step 6: Final answer
    x = 178.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.