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Finding the Fourth Proportional to 723, 998.55 and 489.72

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Solution

The fourth proportional to 723, 998.55 and 489.72 is: 676.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    723 : 998.55 = 489.72 : x
  2. Step 2: Convert to fraction form
    723/998.55 = 489.72/x
  3. Step 3: Cross multiply
    723x = 998.55 × 489.72
  4. Step 4: Simplify right side
    723x = 489,009.91
  5. Step 5: Solve for x
    x = 489,009.91/723
  6. Step 6: Final answer
    x = 676.36

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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.