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Finding the Fourth Proportional to 139.82, 209.21 and 116.75

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Solution

The fourth proportional to 139.82, 209.21 and 116.75 is: 174.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.82 : 209.21 = 116.75 : x
  2. Step 2: Convert to fraction form
    139.82/209.21 = 116.75/x
  3. Step 3: Cross multiply
    139.82x = 209.21 × 116.75
  4. Step 4: Simplify right side
    139.82x = 24,425.21
  5. Step 5: Solve for x
    x = 24,425.21/139.82
  6. Step 6: Final answer
    x = 174.70

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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.