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Finding the Fourth Proportional to 640.52, 961.24 and 255.76

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Solution

The fourth proportional to 640.52, 961.24 and 255.76 is: 383.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.52 : 961.24 = 255.76 : x
  2. Step 2: Convert to fraction form
    640.52/961.24 = 255.76/x
  3. Step 3: Cross multiply
    640.52x = 961.24 × 255.76
  4. Step 4: Simplify right side
    640.52x = 245,846.74
  5. Step 5: Solve for x
    x = 245,846.74/640.52
  6. Step 6: Final answer
    x = 383.82

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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.