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Finding the Fourth Proportional to 724.92, 997.29 and 640.47

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Solution

The fourth proportional to 724.92, 997.29 and 640.47 is: 881.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.92 : 997.29 = 640.47 : x
  2. Step 2: Convert to fraction form
    724.92/997.29 = 640.47/x
  3. Step 3: Cross multiply
    724.92x = 997.29 × 640.47
  4. Step 4: Simplify right side
    724.92x = 638,734.33
  5. Step 5: Solve for x
    x = 638,734.33/724.92
  6. Step 6: Final answer
    x = 881.11

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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.