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Finding the Fourth Proportional to 139.13, 190.88 and 135.54

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Solution

The fourth proportional to 139.13, 190.88 and 135.54 is: 185.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.13 : 190.88 = 135.54 : x
  2. Step 2: Convert to fraction form
    139.13/190.88 = 135.54/x
  3. Step 3: Cross multiply
    139.13x = 190.88 × 135.54
  4. Step 4: Simplify right side
    139.13x = 25,872.21
  5. Step 5: Solve for x
    x = 25,872.21/139.13
  6. Step 6: Final answer
    x = 185.95

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.