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Finding the Fourth Proportional to 629.65, 868.92 and 349.90

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Solution

The fourth proportional to 629.65, 868.92 and 349.90 is: 482.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.65 : 868.92 = 349.90 : x
  2. Step 2: Convert to fraction form
    629.65/868.92 = 349.90/x
  3. Step 3: Cross multiply
    629.65x = 868.92 × 349.90
  4. Step 4: Simplify right side
    629.65x = 304,031.62
  5. Step 5: Solve for x
    x = 304,031.62/629.65
  6. Step 6: Final answer
    x = 482.86

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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.