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Finding the Fourth Proportional to 139.52, 209.40 and 93.88

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Solution

The fourth proportional to 139.52, 209.40 and 93.88 is: 140.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.52 : 209.40 = 93.88 : x
  2. Step 2: Convert to fraction form
    139.52/209.40 = 93.88/x
  3. Step 3: Cross multiply
    139.52x = 209.40 × 93.88
  4. Step 4: Simplify right side
    139.52x = 19,658.47
  5. Step 5: Solve for x
    x = 19,658.47/139.52
  6. Step 6: Final answer
    x = 140.90

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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.