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Finding the Fourth Proportional to 658.61, 908.84 and 378.65

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Solution

The fourth proportional to 658.61, 908.84 and 378.65 is: 522.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.61 : 908.84 = 378.65 : x
  2. Step 2: Convert to fraction form
    658.61/908.84 = 378.65/x
  3. Step 3: Cross multiply
    658.61x = 908.84 × 378.65
  4. Step 4: Simplify right side
    658.61x = 344,132.27
  5. Step 5: Solve for x
    x = 344,132.27/658.61
  6. Step 6: Final answer
    x = 522.51

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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.