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Finding the Fourth Proportional to 135.52, 202.82 and 81.45

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Solution

The fourth proportional to 135.52, 202.82 and 81.45 is: 121.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.52 : 202.82 = 81.45 : x
  2. Step 2: Convert to fraction form
    135.52/202.82 = 81.45/x
  3. Step 3: Cross multiply
    135.52x = 202.82 × 81.45
  4. Step 4: Simplify right side
    135.52x = 16,519.28
  5. Step 5: Solve for x
    x = 16,519.28/135.52
  6. Step 6: Final answer
    x = 121.90

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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.