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Finding the Fourth Proportional to 721.98, 997.65 and 667.31

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Solution

The fourth proportional to 721.98, 997.65 and 667.31 is: 922.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.98 : 997.65 = 667.31 : x
  2. Step 2: Convert to fraction form
    721.98/997.65 = 667.31/x
  3. Step 3: Cross multiply
    721.98x = 997.65 × 667.31
  4. Step 4: Simplify right side
    721.98x = 665,736.83
  5. Step 5: Solve for x
    x = 665,736.83/721.98
  6. Step 6: Final answer
    x = 922.10

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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.