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Finding the Fourth Proportional to 449.11, 620.17 and 318.97

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Solution

The fourth proportional to 449.11, 620.17 and 318.97 is: 440.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.11 : 620.17 = 318.97 : x
  2. Step 2: Convert to fraction form
    449.11/620.17 = 318.97/x
  3. Step 3: Cross multiply
    449.11x = 620.17 × 318.97
  4. Step 4: Simplify right side
    449.11x = 197,817.40
  5. Step 5: Solve for x
    x = 197,817.40/449.11
  6. Step 6: Final answer
    x = 440.46

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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.