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Finding the Fourth Proportional to 489.34, 674.33 and 323.49

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Solution

The fourth proportional to 489.34, 674.33 and 323.49 is: 445.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.34 : 674.33 = 323.49 : x
  2. Step 2: Convert to fraction form
    489.34/674.33 = 323.49/x
  3. Step 3: Cross multiply
    489.34x = 674.33 × 323.49
  4. Step 4: Simplify right side
    489.34x = 218,139.92
  5. Step 5: Solve for x
    x = 218,139.92/489.34
  6. Step 6: Final answer
    x = 445.78

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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.