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Finding the Fourth Proportional to 629.92, 869.28 and 396.96

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Solution

The fourth proportional to 629.92, 869.28 and 396.96 is: 547.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.92 : 869.28 = 396.96 : x
  2. Step 2: Convert to fraction form
    629.92/869.28 = 396.96/x
  3. Step 3: Cross multiply
    629.92x = 869.28 × 396.96
  4. Step 4: Simplify right side
    629.92x = 345,069.39
  5. Step 5: Solve for x
    x = 345,069.39/629.92
  6. Step 6: Final answer
    x = 547.80

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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.