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Finding the Fourth Proportional to 658.36, 908.46 and 396.40

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Solution

The fourth proportional to 658.36, 908.46 and 396.40 is: 546.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.36 : 908.46 = 396.40 : x
  2. Step 2: Convert to fraction form
    658.36/908.46 = 396.40/x
  3. Step 3: Cross multiply
    658.36x = 908.46 × 396.40
  4. Step 4: Simplify right side
    658.36x = 360,113.54
  5. Step 5: Solve for x
    x = 360,113.54/658.36
  6. Step 6: Final answer
    x = 546.99

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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.