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Finding the Third Proportional to 129,816 and 287,811

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Solution

The third proportional to 129,816 and 287,811 is: 638,096.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,816 : 287,811 = 287,811 : x
  2. Step 2: Convert to fraction form
    129,816/287,811 = 287,811/x
  3. Step 3: Cross multiply
    129,816x = 287,811 × 287,811
  4. Step 4: Simplify right side
    129,816x = 82,835,171,721
  5. Step 5: Solve for x
    x = 82,835,171,721/129,816
  6. Step 6: Final answer
    x = 638,096.78

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.