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Finding the Fourth Proportional to 449.73, 621.61 and 396.90

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Solution

The fourth proportional to 449.73, 621.61 and 396.90 is: 548.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.73 : 621.61 = 396.90 : x
  2. Step 2: Convert to fraction form
    449.73/621.61 = 396.90/x
  3. Step 3: Cross multiply
    449.73x = 621.61 × 396.90
  4. Step 4: Simplify right side
    449.73x = 246,716.02
  5. Step 5: Solve for x
    x = 246,716.02/449.73
  6. Step 6: Final answer
    x = 548.59

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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.