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Finding the Fourth Proportional to 658.93, 908.79 and 396.89

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Solution

The fourth proportional to 658.93, 908.79 and 396.89 is: 547.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.93 : 908.79 = 396.89 : x
  2. Step 2: Convert to fraction form
    658.93/908.79 = 396.89/x
  3. Step 3: Cross multiply
    658.93x = 908.79 × 396.89
  4. Step 4: Simplify right side
    658.93x = 360,689.66
  5. Step 5: Solve for x
    x = 360,689.66/658.93
  6. Step 6: Final answer
    x = 547.39

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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.