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Finding the Fourth Proportional to 640.92, 962.34 and 256.92

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Solution

The fourth proportional to 640.92, 962.34 and 256.92 is: 385.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.92 : 962.34 = 256.92 : x
  2. Step 2: Convert to fraction form
    640.92/962.34 = 256.92/x
  3. Step 3: Cross multiply
    640.92x = 962.34 × 256.92
  4. Step 4: Simplify right side
    640.92x = 247,244.39
  5. Step 5: Solve for x
    x = 247,244.39/640.92
  6. Step 6: Final answer
    x = 385.76

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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.