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Finding the Fourth Proportional to 139.73, 191.16 and 139.12

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Solution

The fourth proportional to 139.73, 191.16 and 139.12 is: 190.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.73 : 191.16 = 139.12 : x
  2. Step 2: Convert to fraction form
    139.73/191.16 = 139.12/x
  3. Step 3: Cross multiply
    139.73x = 191.16 × 139.12
  4. Step 4: Simplify right side
    139.73x = 26,593.70
  5. Step 5: Solve for x
    x = 26,593.70/139.73
  6. Step 6: Final answer
    x = 190.33

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.