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Finding the Fourth Proportional to 629.78, 868.50 and 408.62

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Solution

The fourth proportional to 629.78, 868.50 and 408.62 is: 563.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.78 : 868.50 = 408.62 : x
  2. Step 2: Convert to fraction form
    629.78/868.50 = 408.62/x
  3. Step 3: Cross multiply
    629.78x = 868.50 × 408.62
  4. Step 4: Simplify right side
    629.78x = 354,886.47
  5. Step 5: Solve for x
    x = 354,886.47/629.78
  6. Step 6: Final answer
    x = 563.51

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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.