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Finding the Fourth Proportional to 139.06, 207.57 and 135.21

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Solution

The fourth proportional to 139.06, 207.57 and 135.21 is: 201.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.06 : 207.57 = 135.21 : x
  2. Step 2: Convert to fraction form
    139.06/207.57 = 135.21/x
  3. Step 3: Cross multiply
    139.06x = 207.57 × 135.21
  4. Step 4: Simplify right side
    139.06x = 28,065.54
  5. Step 5: Solve for x
    x = 28,065.54/139.06
  6. Step 6: Final answer
    x = 201.83

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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.