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Finding the Fourth Proportional to 449.45, 620.82 and 331.66

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Solution

The fourth proportional to 449.45, 620.82 and 331.66 is: 458.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.45 : 620.82 = 331.66 : x
  2. Step 2: Convert to fraction form
    449.45/620.82 = 331.66/x
  3. Step 3: Cross multiply
    449.45x = 620.82 × 331.66
  4. Step 4: Simplify right side
    449.45x = 205,899.61
  5. Step 5: Solve for x
    x = 205,899.61/449.45
  6. Step 6: Final answer
    x = 458.12

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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.