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Finding the Third Proportional to 392.75 and 863.88

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Solution

The third proportional to 392.75 and 863.88 is: 1,900.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.75 : 863.88 = 863.88 : x
  2. Step 2: Convert to fraction form
    392.75/863.88 = 863.88/x
  3. Step 3: Cross multiply
    392.75x = 863.88 × 863.88
  4. Step 4: Simplify right side
    392.75x = 746,280.02
  5. Step 5: Solve for x
    x = 746,280.02/392.75
  6. Step 6: Final answer
    x = 1,900.14

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.