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Finding the Fourth Proportional to 139.46, 209.20 and 67.22

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Solution

The fourth proportional to 139.46, 209.20 and 67.22 is: 100.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.46 : 209.20 = 67.22 : x
  2. Step 2: Convert to fraction form
    139.46/209.20 = 67.22/x
  3. Step 3: Cross multiply
    139.46x = 209.20 × 67.22
  4. Step 4: Simplify right side
    139.46x = 14,062.42
  5. Step 5: Solve for x
    x = 14,062.42/139.46
  6. Step 6: Final answer
    x = 100.83

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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.