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Finding the Fourth Proportional to 496.40, 742.98 and 489.92

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Solution

The fourth proportional to 496.40, 742.98 and 489.92 is: 733.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    496.40 : 742.98 = 489.92 : x
  2. Step 2: Convert to fraction form
    496.40/742.98 = 489.92/x
  3. Step 3: Cross multiply
    496.40x = 742.98 × 489.92
  4. Step 4: Simplify right side
    496.40x = 364,000.76
  5. Step 5: Solve for x
    x = 364,000.76/496.40
  6. Step 6: Final answer
    x = 733.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.