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Finding the Fourth Proportional to 331.03, 457.21 and 220.31

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Solution

The fourth proportional to 331.03, 457.21 and 220.31 is: 304.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.03 : 457.21 = 220.31 : x
  2. Step 2: Convert to fraction form
    331.03/457.21 = 220.31/x
  3. Step 3: Cross multiply
    331.03x = 457.21 × 220.31
  4. Step 4: Simplify right side
    331.03x = 100,724.55
  5. Step 5: Solve for x
    x = 100,724.55/331.03
  6. Step 6: Final answer
    x = 304.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.