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Finding the Fourth Proportional to 489.33, 674.88 and 331.88

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Solution

The fourth proportional to 489.33, 674.88 and 331.88 is: 457.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.33 : 674.88 = 331.88 : x
  2. Step 2: Convert to fraction form
    489.33/674.88 = 331.88/x
  3. Step 3: Cross multiply
    489.33x = 674.88 × 331.88
  4. Step 4: Simplify right side
    489.33x = 223,975.80
  5. Step 5: Solve for x
    x = 223,975.80/489.33
  6. Step 6: Final answer
    x = 457.72

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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.