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Finding the Fourth Proportional to 139.45, 191.67 and 122.98

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Solution

The fourth proportional to 139.45, 191.67 and 122.98 is: 169.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.45 : 191.67 = 122.98 : x
  2. Step 2: Convert to fraction form
    139.45/191.67 = 122.98/x
  3. Step 3: Cross multiply
    139.45x = 191.67 × 122.98
  4. Step 4: Simplify right side
    139.45x = 23,571.58
  5. Step 5: Solve for x
    x = 23,571.58/139.45
  6. Step 6: Final answer
    x = 169.03

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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.