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Finding the Fourth Proportional to 628.88, 867.87 and 396.41

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Solution

The fourth proportional to 628.88, 867.87 and 396.41 is: 547.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.88 : 867.87 = 396.41 : x
  2. Step 2: Convert to fraction form
    628.88/867.87 = 396.41/x
  3. Step 3: Cross multiply
    628.88x = 867.87 × 396.41
  4. Step 4: Simplify right side
    628.88x = 344,028.01
  5. Step 5: Solve for x
    x = 344,028.01/628.88
  6. Step 6: Final answer
    x = 547.05

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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.