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Finding the Third Proportional to 51,808 and 81,390

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Solution

The third proportional to 51,808 and 81,390 is: 127,863.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,808 : 81,390 = 81,390 : x
  2. Step 2: Convert to fraction form
    51,808/81,390 = 81,390/x
  3. Step 3: Cross multiply
    51,808x = 81,390 × 81,390
  4. Step 4: Simplify right side
    51,808x = 6,624,332,100
  5. Step 5: Solve for x
    x = 6,624,332,100/51,808
  6. Step 6: Final answer
    x = 127,863.11

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.