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Finding the Fourth Proportional to 629.45, 868.70 and 349.78

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Solution

The fourth proportional to 629.45, 868.70 and 349.78 is: 482.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.45 : 868.70 = 349.78 : x
  2. Step 2: Convert to fraction form
    629.45/868.70 = 349.78/x
  3. Step 3: Cross multiply
    629.45x = 868.70 × 349.78
  4. Step 4: Simplify right side
    629.45x = 303,847.79
  5. Step 5: Solve for x
    x = 303,847.79/629.45
  6. Step 6: Final answer
    x = 482.72

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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.