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Finding the Fourth Proportional to 139.93, 209.52 and 112.38

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Solution

The fourth proportional to 139.93, 209.52 and 112.38 is: 168.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.93 : 209.52 = 112.38 : x
  2. Step 2: Convert to fraction form
    139.93/209.52 = 112.38/x
  3. Step 3: Cross multiply
    139.93x = 209.52 × 112.38
  4. Step 4: Simplify right side
    139.93x = 23,545.86
  5. Step 5: Solve for x
    x = 23,545.86/139.93
  6. Step 6: Final answer
    x = 168.27

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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.