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Finding the Fourth Proportional to 139.03, 191.86 and 107.98

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Solution

The fourth proportional to 139.03, 191.86 and 107.98 is: 149.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.03 : 191.86 = 107.98 : x
  2. Step 2: Convert to fraction form
    139.03/191.86 = 107.98/x
  3. Step 3: Cross multiply
    139.03x = 191.86 × 107.98
  4. Step 4: Simplify right side
    139.03x = 20,716.50
  5. Step 5: Solve for x
    x = 20,716.50/139.03
  6. Step 6: Final answer
    x = 149.01

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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.