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Finding the Fourth Proportional to 226.48, 339.78 and 82.21

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Solution

The fourth proportional to 226.48, 339.78 and 82.21 is: 123.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.48 : 339.78 = 82.21 : x
  2. Step 2: Convert to fraction form
    226.48/339.78 = 82.21/x
  3. Step 3: Cross multiply
    226.48x = 339.78 × 82.21
  4. Step 4: Simplify right side
    226.48x = 27,933.31
  5. Step 5: Solve for x
    x = 27,933.31/226.48
  6. Step 6: Final answer
    x = 123.34

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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.