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Finding the Fourth Proportional to 658.88, 909.25 and 396.95

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Solution

The fourth proportional to 658.88, 909.25 and 396.95 is: 547.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.88 : 909.25 = 396.95 : x
  2. Step 2: Convert to fraction form
    658.88/909.25 = 396.95/x
  3. Step 3: Cross multiply
    658.88x = 909.25 × 396.95
  4. Step 4: Simplify right side
    658.88x = 360,921.25
  5. Step 5: Solve for x
    x = 360,921.25/658.88
  6. Step 6: Final answer
    x = 547.78

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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.