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Finding the Fourth Proportional to 139.84, 209.78 and 134.37

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Solution

The fourth proportional to 139.84, 209.78 and 134.37 is: 201.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.84 : 209.78 = 134.37 : x
  2. Step 2: Convert to fraction form
    139.84/209.78 = 134.37/x
  3. Step 3: Cross multiply
    139.84x = 209.78 × 134.37
  4. Step 4: Simplify right side
    139.84x = 28,188.08
  5. Step 5: Solve for x
    x = 28,188.08/139.84
  6. Step 6: Final answer
    x = 201.58

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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.