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Finding the Fourth Proportional to 226.76, 339.80 and 139.85

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Solution

The fourth proportional to 226.76, 339.80 and 139.85 is: 209.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.76 : 339.80 = 139.85 : x
  2. Step 2: Convert to fraction form
    226.76/339.80 = 139.85/x
  3. Step 3: Cross multiply
    226.76x = 339.80 × 139.85
  4. Step 4: Simplify right side
    226.76x = 47,519.91
  5. Step 5: Solve for x
    x = 47,519.91/226.76
  6. Step 6: Final answer
    x = 209.56

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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.