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Finding the Fourth Proportional to 619.21, 928.82 and 331.21

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Solution

The fourth proportional to 619.21, 928.82 and 331.21 is: 496.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.21 : 928.82 = 331.21 : x
  2. Step 2: Convert to fraction form
    619.21/928.82 = 331.21/x
  3. Step 3: Cross multiply
    619.21x = 928.82 × 331.21
  4. Step 4: Simplify right side
    619.21x = 307,634.47
  5. Step 5: Solve for x
    x = 307,634.47/619.21
  6. Step 6: Final answer
    x = 496.82

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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.