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Finding the Fourth Proportional to 139.74, 208.14 and 134.25

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Solution

The fourth proportional to 139.74, 208.14 and 134.25 is: 199.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.74 : 208.14 = 134.25 : x
  2. Step 2: Convert to fraction form
    139.74/208.14 = 134.25/x
  3. Step 3: Cross multiply
    139.74x = 208.14 × 134.25
  4. Step 4: Simplify right side
    139.74x = 27,942.80
  5. Step 5: Solve for x
    x = 27,942.80/139.74
  6. Step 6: Final answer
    x = 199.96

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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.