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Finding the Fourth Proportional to 401.28, 552.80 and 331.04

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Solution

The fourth proportional to 401.28, 552.80 and 331.04 is: 456.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.28 : 552.80 = 331.04 : x
  2. Step 2: Convert to fraction form
    401.28/552.80 = 331.04/x
  3. Step 3: Cross multiply
    401.28x = 552.80 × 331.04
  4. Step 4: Simplify right side
    401.28x = 182,998.91
  5. Step 5: Solve for x
    x = 182,998.91/401.28
  6. Step 6: Final answer
    x = 456.04

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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.