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Finding the Fourth Proportional to 640.49, 960.75 and 396.27

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Solution

The fourth proportional to 640.49, 960.75 and 396.27 is: 594.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.49 : 960.75 = 396.27 : x
  2. Step 2: Convert to fraction form
    640.49/960.75 = 396.27/x
  3. Step 3: Cross multiply
    640.49x = 960.75 × 396.27
  4. Step 4: Simplify right side
    640.49x = 380,716.40
  5. Step 5: Solve for x
    x = 380,716.40/640.49
  6. Step 6: Final answer
    x = 594.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.