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Finding the Fourth Proportional to 640.91, 960.00 and 396.70

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Solution

The fourth proportional to 640.91, 960.00 and 396.70 is: 594.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.91 : 960.00 = 396.70 : x
  2. Step 2: Convert to fraction form
    640.91/960.00 = 396.70/x
  3. Step 3: Cross multiply
    640.91x = 960.00 × 396.70
  4. Step 4: Simplify right side
    640.91x = 380,830.34
  5. Step 5: Solve for x
    x = 380,830.34/640.91
  6. Step 6: Final answer
    x = 594.20

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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.