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Finding the Fourth Proportional to 723.13, 998.73 and 489.85

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Solution

The fourth proportional to 723.13, 998.73 and 489.85 is: 676.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.13 : 998.73 = 489.85 : x
  2. Step 2: Convert to fraction form
    723.13/998.73 = 489.85/x
  3. Step 3: Cross multiply
    723.13x = 998.73 × 489.85
  4. Step 4: Simplify right side
    723.13x = 489,221.67
  5. Step 5: Solve for x
    x = 489,221.67/723.13
  6. Step 6: Final answer
    x = 676.54

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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.