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Finding the Fourth Proportional to 640.97, 884.49 and 378.94

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Solution

The fourth proportional to 640.97, 884.49 and 378.94 is: 522.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.97 : 884.49 = 378.94 : x
  2. Step 2: Convert to fraction form
    640.97/884.49 = 378.94/x
  3. Step 3: Cross multiply
    640.97x = 884.49 × 378.94
  4. Step 4: Simplify right side
    640.97x = 335,168.64
  5. Step 5: Solve for x
    x = 335,168.64/640.97
  6. Step 6: Final answer
    x = 522.91

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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.