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Finding the Fourth Proportional to 449.31, 673.98 and 319.89

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Solution

The fourth proportional to 449.31, 673.98 and 319.89 is: 479.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.31 : 673.98 = 319.89 : x
  2. Step 2: Convert to fraction form
    449.31/673.98 = 319.89/x
  3. Step 3: Cross multiply
    449.31x = 673.98 × 319.89
  4. Step 4: Simplify right side
    449.31x = 215,599.46
  5. Step 5: Solve for x
    x = 215,599.46/449.31
  6. Step 6: Final answer
    x = 479.85

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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.