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Finding the Fourth Proportional to 629.20, 868.28 and 380.48

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Solution

The fourth proportional to 629.20, 868.28 and 380.48 is: 525.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.20 : 868.28 = 380.48 : x
  2. Step 2: Convert to fraction form
    629.20/868.28 = 380.48/x
  3. Step 3: Cross multiply
    629.20x = 868.28 × 380.48
  4. Step 4: Simplify right side
    629.20x = 330,363.17
  5. Step 5: Solve for x
    x = 330,363.17/629.20
  6. Step 6: Final answer
    x = 525.05

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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.