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Finding the Fourth Proportional to 331.28, 457.40 and 220.98

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Solution

The fourth proportional to 331.28, 457.40 and 220.98 is: 305.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.28 : 457.40 = 220.98 : x
  2. Step 2: Convert to fraction form
    331.28/457.40 = 220.98/x
  3. Step 3: Cross multiply
    331.28x = 457.40 × 220.98
  4. Step 4: Simplify right side
    331.28x = 101,076.25
  5. Step 5: Solve for x
    x = 101,076.25/331.28
  6. Step 6: Final answer
    x = 305.11

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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.