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Finding the Fourth Proportional to 629.11, 867.21 and 518.39

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Solution

The fourth proportional to 629.11, 867.21 and 518.39 is: 714.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.11 : 867.21 = 518.39 : x
  2. Step 2: Convert to fraction form
    629.11/867.21 = 518.39/x
  3. Step 3: Cross multiply
    629.11x = 867.21 × 518.39
  4. Step 4: Simplify right side
    629.11x = 449,552.99
  5. Step 5: Solve for x
    x = 449,552.99/629.11
  6. Step 6: Final answer
    x = 714.59

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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.