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Finding the Fourth Proportional to 489.82, 674.30 and 379.09

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Solution

The fourth proportional to 489.82, 674.30 and 379.09 is: 521.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.82 : 674.30 = 379.09 : x
  2. Step 2: Convert to fraction form
    489.82/674.30 = 379.09/x
  3. Step 3: Cross multiply
    489.82x = 674.30 × 379.09
  4. Step 4: Simplify right side
    489.82x = 255,620.39
  5. Step 5: Solve for x
    x = 255,620.39/489.82
  6. Step 6: Final answer
    x = 521.87

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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.