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Finding the Fourth Proportional to 138.55, 191.02 and 99.27

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Solution

The fourth proportional to 138.55, 191.02 and 99.27 is: 136.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.55 : 191.02 = 99.27 : x
  2. Step 2: Convert to fraction form
    138.55/191.02 = 99.27/x
  3. Step 3: Cross multiply
    138.55x = 191.02 × 99.27
  4. Step 4: Simplify right side
    138.55x = 18,962.56
  5. Step 5: Solve for x
    x = 18,962.56/138.55
  6. Step 6: Final answer
    x = 136.86

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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.