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Finding the Fourth Proportional to 640.32, 959.16 and 517.92

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Solution

The fourth proportional to 640.32, 959.16 and 517.92 is: 775.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.32 : 959.16 = 517.92 : x
  2. Step 2: Convert to fraction form
    640.32/959.16 = 517.92/x
  3. Step 3: Cross multiply
    640.32x = 959.16 × 517.92
  4. Step 4: Simplify right side
    640.32x = 496,768.15
  5. Step 5: Solve for x
    x = 496,768.15/640.32
  6. Step 6: Final answer
    x = 775.81

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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.