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Finding the Fourth Proportional to 139.05, 207.36 and 135.27

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Solution

The fourth proportional to 139.05, 207.36 and 135.27 is: 201.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.05 : 207.36 = 135.27 : x
  2. Step 2: Convert to fraction form
    139.05/207.36 = 135.27/x
  3. Step 3: Cross multiply
    139.05x = 207.36 × 135.27
  4. Step 4: Simplify right side
    139.05x = 28,049.59
  5. Step 5: Solve for x
    x = 28,049.59/139.05
  6. Step 6: Final answer
    x = 201.72

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.