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Finding the Fourth Proportional to 426.46, 638.75 and 221.23

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Solution

The fourth proportional to 426.46, 638.75 and 221.23 is: 331.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.46 : 638.75 = 221.23 : x
  2. Step 2: Convert to fraction form
    426.46/638.75 = 221.23/x
  3. Step 3: Cross multiply
    426.46x = 638.75 × 221.23
  4. Step 4: Simplify right side
    426.46x = 141,310.66
  5. Step 5: Solve for x
    x = 141,310.66/426.46
  6. Step 6: Final answer
    x = 331.36

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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.