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Finding the Fourth Proportional to 226.81, 339.75 and 139.87

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Solution

The fourth proportional to 226.81, 339.75 and 139.87 is: 209.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.81 : 339.75 = 139.87 : x
  2. Step 2: Convert to fraction form
    226.81/339.75 = 139.87/x
  3. Step 3: Cross multiply
    226.81x = 339.75 × 139.87
  4. Step 4: Simplify right side
    226.81x = 47,520.83
  5. Step 5: Solve for x
    x = 47,520.83/226.81
  6. Step 6: Final answer
    x = 209.52

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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.