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Finding the Fourth Proportional to 138.67, 208.10 and 55.29

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Solution

The fourth proportional to 138.67, 208.10 and 55.29 is: 82.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.67 : 208.10 = 55.29 : x
  2. Step 2: Convert to fraction form
    138.67/208.10 = 55.29/x
  3. Step 3: Cross multiply
    138.67x = 208.10 × 55.29
  4. Step 4: Simplify right side
    138.67x = 11,505.85
  5. Step 5: Solve for x
    x = 11,505.85/138.67
  6. Step 6: Final answer
    x = 82.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.