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Finding the Fourth Proportional to 138.98, 191.86 and 94.95

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Solution

The fourth proportional to 138.98, 191.86 and 94.95 is: 131.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.98 : 191.86 = 94.95 : x
  2. Step 2: Convert to fraction form
    138.98/191.86 = 94.95/x
  3. Step 3: Cross multiply
    138.98x = 191.86 × 94.95
  4. Step 4: Simplify right side
    138.98x = 18,217.14
  5. Step 5: Solve for x
    x = 18,217.14/138.98
  6. Step 6: Final answer
    x = 131.08

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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.