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Finding the Fourth Proportional to 138.58, 191 and 94.84

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Solution

The fourth proportional to 138.58, 191 and 94.84 is: 130.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.58 : 191 = 94.84 : x
  2. Step 2: Convert to fraction form
    138.58/191 = 94.84/x
  3. Step 3: Cross multiply
    138.58x = 191 × 94.84
  4. Step 4: Simplify right side
    138.58x = 18,114.44
  5. Step 5: Solve for x
    x = 18,114.44/138.58
  6. Step 6: Final answer
    x = 130.71

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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.