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Finding the Fourth Proportional to 629.39, 868.55 and 349.61

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Solution

The fourth proportional to 629.39, 868.55 and 349.61 is: 482.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.39 : 868.55 = 349.61 : x
  2. Step 2: Convert to fraction form
    629.39/868.55 = 349.61/x
  3. Step 3: Cross multiply
    629.39x = 868.55 × 349.61
  4. Step 4: Simplify right side
    629.39x = 303,653.77
  5. Step 5: Solve for x
    x = 303,653.77/629.39
  6. Step 6: Final answer
    x = 482.46

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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.