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Finding the Fourth Proportional to 629.35, 868.15 and 393.21

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Solution

The fourth proportional to 629.35, 868.15 and 393.21 is: 542.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.35 : 868.15 = 393.21 : x
  2. Step 2: Convert to fraction form
    629.35/868.15 = 393.21/x
  3. Step 3: Cross multiply
    629.35x = 868.15 × 393.21
  4. Step 4: Simplify right side
    629.35x = 341,365.26
  5. Step 5: Solve for x
    x = 341,365.26/629.35
  6. Step 6: Final answer
    x = 542.41

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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.