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Finding the Fourth Proportional to 723.40, 998.08 and 490.56

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Solution

The fourth proportional to 723.40, 998.08 and 490.56 is: 676.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.40 : 998.08 = 490.56 : x
  2. Step 2: Convert to fraction form
    723.40/998.08 = 490.56/x
  3. Step 3: Cross multiply
    723.40x = 998.08 × 490.56
  4. Step 4: Simplify right side
    723.40x = 489,618.12
  5. Step 5: Solve for x
    x = 489,618.12/723.40
  6. Step 6: Final answer
    x = 676.83

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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.