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Finding the Fourth Proportional to 138.96, 208.02 and 108.57

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Solution

The fourth proportional to 138.96, 208.02 and 108.57 is: 162.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.96 : 208.02 = 108.57 : x
  2. Step 2: Convert to fraction form
    138.96/208.02 = 108.57/x
  3. Step 3: Cross multiply
    138.96x = 208.02 × 108.57
  4. Step 4: Simplify right side
    138.96x = 22,584.73
  5. Step 5: Solve for x
    x = 22,584.73/138.96
  6. Step 6: Final answer
    x = 162.53

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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.