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Finding the Fourth Proportional to 658.50, 908.90 and 378.76

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Solution

The fourth proportional to 658.50, 908.90 and 378.76 is: 522.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.50 : 908.90 = 378.76 : x
  2. Step 2: Convert to fraction form
    658.50/908.90 = 378.76/x
  3. Step 3: Cross multiply
    658.50x = 908.90 × 378.76
  4. Step 4: Simplify right side
    658.50x = 344,258.18
  5. Step 5: Solve for x
    x = 344,258.18/658.50
  6. Step 6: Final answer
    x = 522.79

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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.