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Finding the Fourth Proportional to 449.34, 673.39 and 391.42

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Solution

The fourth proportional to 449.34, 673.39 and 391.42 is: 586.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.34 : 673.39 = 391.42 : x
  2. Step 2: Convert to fraction form
    449.34/673.39 = 391.42/x
  3. Step 3: Cross multiply
    449.34x = 673.39 × 391.42
  4. Step 4: Simplify right side
    449.34x = 263,578.31
  5. Step 5: Solve for x
    x = 263,578.31/449.34
  6. Step 6: Final answer
    x = 586.59

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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.