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Finding the Fourth Proportional to 629.88, 868.94 and 393.68

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Solution

The fourth proportional to 629.88, 868.94 and 393.68 is: 543.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.88 : 868.94 = 393.68 : x
  2. Step 2: Convert to fraction form
    629.88/868.94 = 393.68/x
  3. Step 3: Cross multiply
    629.88x = 868.94 × 393.68
  4. Step 4: Simplify right side
    629.88x = 342,084.30
  5. Step 5: Solve for x
    x = 342,084.30/629.88
  6. Step 6: Final answer
    x = 543.09

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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.