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Finding the Fourth Proportional to 628.97, 868.12 and 380.43

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Solution

The fourth proportional to 628.97, 868.12 and 380.43 is: 525.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.97 : 868.12 = 380.43 : x
  2. Step 2: Convert to fraction form
    628.97/868.12 = 380.43/x
  3. Step 3: Cross multiply
    628.97x = 868.12 × 380.43
  4. Step 4: Simplify right side
    628.97x = 330,257.94
  5. Step 5: Solve for x
    x = 330,257.94/628.97
  6. Step 6: Final answer
    x = 525.08

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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.