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Finding the Fourth Proportional to 449.67, 674.82 and 319.68

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Solution

The fourth proportional to 449.67, 674.82 and 319.68 is: 479.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.67 : 674.82 = 319.68 : x
  2. Step 2: Convert to fraction form
    449.67/674.82 = 319.68/x
  3. Step 3: Cross multiply
    449.67x = 674.82 × 319.68
  4. Step 4: Simplify right side
    449.67x = 215,726.46
  5. Step 5: Solve for x
    x = 215,726.46/449.67
  6. Step 6: Final answer
    x = 479.74

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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.