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Finding the Fourth Proportional to 139.11, 191.72 and 116.91

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Solution

The fourth proportional to 139.11, 191.72 and 116.91 is: 161.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.11 : 191.72 = 116.91 : x
  2. Step 2: Convert to fraction form
    139.11/191.72 = 116.91/x
  3. Step 3: Cross multiply
    139.11x = 191.72 × 116.91
  4. Step 4: Simplify right side
    139.11x = 22,413.40
  5. Step 5: Solve for x
    x = 22,413.40/139.11
  6. Step 6: Final answer
    x = 161.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.