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Finding the Fourth Proportional to 629.68, 868.80 and 380.92

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Solution

The fourth proportional to 629.68, 868.80 and 380.92 is: 525.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.68 : 868.80 = 380.92 : x
  2. Step 2: Convert to fraction form
    629.68/868.80 = 380.92/x
  3. Step 3: Cross multiply
    629.68x = 868.80 × 380.92
  4. Step 4: Simplify right side
    629.68x = 330,943.30
  5. Step 5: Solve for x
    x = 330,943.30/629.68
  6. Step 6: Final answer
    x = 525.57

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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.