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Finding the Fourth Proportional to 640.73, 961.10 and 255.98

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Solution

The fourth proportional to 640.73, 961.10 and 255.98 is: 383.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.73 : 961.10 = 255.98 : x
  2. Step 2: Convert to fraction form
    640.73/961.10 = 255.98/x
  3. Step 3: Cross multiply
    640.73x = 961.10 × 255.98
  4. Step 4: Simplify right side
    640.73x = 246,022.38
  5. Step 5: Solve for x
    x = 246,022.38/640.73
  6. Step 6: Final answer
    x = 383.97

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Similar ratio
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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.