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Finding the Fourth Proportional to 139.11, 208.05 and 111.57

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Solution

The fourth proportional to 139.11, 208.05 and 111.57 is: 166.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.11 : 208.05 = 111.57 : x
  2. Step 2: Convert to fraction form
    139.11/208.05 = 111.57/x
  3. Step 3: Cross multiply
    139.11x = 208.05 × 111.57
  4. Step 4: Simplify right side
    139.11x = 23,212.14
  5. Step 5: Solve for x
    x = 23,212.14/139.11
  6. Step 6: Final answer
    x = 166.86

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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.