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Finding the Fourth Proportional to 489.97, 674.76 and 391.42

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Solution

The fourth proportional to 489.97, 674.76 and 391.42 is: 539.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.97 : 674.76 = 391.42 : x
  2. Step 2: Convert to fraction form
    489.97/674.76 = 391.42/x
  3. Step 3: Cross multiply
    489.97x = 674.76 × 391.42
  4. Step 4: Simplify right side
    489.97x = 264,114.56
  5. Step 5: Solve for x
    x = 264,114.56/489.97
  6. Step 6: Final answer
    x = 539.04

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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.