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Finding the Fourth Proportional to 139.47, 191.97 and 120.97

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Solution

The fourth proportional to 139.47, 191.97 and 120.97 is: 166.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.47 : 191.97 = 120.97 : x
  2. Step 2: Convert to fraction form
    139.47/191.97 = 120.97/x
  3. Step 3: Cross multiply
    139.47x = 191.97 × 120.97
  4. Step 4: Simplify right side
    139.47x = 23,222.61
  5. Step 5: Solve for x
    x = 23,222.61/139.47
  6. Step 6: Final answer
    x = 166.51

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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.