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Finding the Fourth Proportional to 658.47, 908.61 and 378.63

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Solution

The fourth proportional to 658.47, 908.61 and 378.63 is: 522.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.47 : 908.61 = 378.63 : x
  2. Step 2: Convert to fraction form
    658.47/908.61 = 378.63/x
  3. Step 3: Cross multiply
    658.47x = 908.61 × 378.63
  4. Step 4: Simplify right side
    658.47x = 344,027.00
  5. Step 5: Solve for x
    x = 344,027.00/658.47
  6. Step 6: Final answer
    x = 522.46

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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.