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Finding the Fourth Proportional to 449.28, 673.28 and 319.68

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Solution

The fourth proportional to 449.28, 673.28 and 319.68 is: 479.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.28 : 673.28 = 319.68 : x
  2. Step 2: Convert to fraction form
    449.28/673.28 = 319.68/x
  3. Step 3: Cross multiply
    449.28x = 673.28 × 319.68
  4. Step 4: Simplify right side
    449.28x = 215,234.15
  5. Step 5: Solve for x
    x = 215,234.15/449.28
  6. Step 6: Final answer
    x = 479.06

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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.