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Finding the Fourth Proportional to 722.75, 998.21 and 489.47

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Solution

The fourth proportional to 722.75, 998.21 and 489.47 is: 676.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.75 : 998.21 = 489.47 : x
  2. Step 2: Convert to fraction form
    722.75/998.21 = 489.47/x
  3. Step 3: Cross multiply
    722.75x = 998.21 × 489.47
  4. Step 4: Simplify right side
    722.75x = 488,593.85
  5. Step 5: Solve for x
    x = 488,593.85/722.75
  6. Step 6: Final answer
    x = 676.02

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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.