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Finding the Fourth Proportional to 449.19, 674.21 and 318.82

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Solution

The fourth proportional to 449.19, 674.21 and 318.82 is: 478.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.19 : 674.21 = 318.82 : x
  2. Step 2: Convert to fraction form
    449.19/674.21 = 318.82/x
  3. Step 3: Cross multiply
    449.19x = 674.21 × 318.82
  4. Step 4: Simplify right side
    449.19x = 214,951.63
  5. Step 5: Solve for x
    x = 214,951.63/449.19
  6. Step 6: Final answer
    x = 478.53

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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.