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Finding the Fourth Proportional to 449.20, 674.22 and 439.18

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Solution

The fourth proportional to 449.20, 674.22 and 439.18 is: 659.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.20 : 674.22 = 439.18 : x
  2. Step 2: Convert to fraction form
    449.20/674.22 = 439.18/x
  3. Step 3: Cross multiply
    449.20x = 674.22 × 439.18
  4. Step 4: Simplify right side
    449.20x = 296,103.94
  5. Step 5: Solve for x
    x = 296,103.94/449.20
  6. Step 6: Final answer
    x = 659.18

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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.