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Finding the Fourth Proportional to 658.42, 908.57 and 378.70

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Solution

The fourth proportional to 658.42, 908.57 and 378.70 is: 522.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.42 : 908.57 = 378.70 : x
  2. Step 2: Convert to fraction form
    658.42/908.57 = 378.70/x
  3. Step 3: Cross multiply
    658.42x = 908.57 × 378.70
  4. Step 4: Simplify right side
    658.42x = 344,074.13
  5. Step 5: Solve for x
    x = 344,074.13/658.42
  6. Step 6: Final answer
    x = 522.58

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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.