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Finding the Fourth Proportional to 489.39, 674.89 and 331.98

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Solution

The fourth proportional to 489.39, 674.89 and 331.98 is: 457.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.39 : 674.89 = 331.98 : x
  2. Step 2: Convert to fraction form
    489.39/674.89 = 331.98/x
  3. Step 3: Cross multiply
    489.39x = 674.89 × 331.98
  4. Step 4: Simplify right side
    489.39x = 224,049.98
  5. Step 5: Solve for x
    x = 224,049.98/489.39
  6. Step 6: Final answer
    x = 457.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.