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Finding the Fourth Proportional to 522.90, 721.97 and 489.82

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Solution

The fourth proportional to 522.90, 721.97 and 489.82 is: 676.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.90 : 721.97 = 489.82 : x
  2. Step 2: Convert to fraction form
    522.90/721.97 = 489.82/x
  3. Step 3: Cross multiply
    522.90x = 721.97 × 489.82
  4. Step 4: Simplify right side
    522.90x = 353,635.35
  5. Step 5: Solve for x
    x = 353,635.35/522.90
  6. Step 6: Final answer
    x = 676.30

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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.