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Finding the Third Proportional to 3,986.72 and 8,611.31

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Solution

The third proportional to 3,986.72 and 8,611.31 is: 18,600.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.72 : 8,611.31 = 8,611.31 : x
  2. Step 2: Convert to fraction form
    3,986.72/8,611.31 = 8,611.31/x
  3. Step 3: Cross multiply
    3,986.72x = 8,611.31 × 8,611.31
  4. Step 4: Simplify right side
    3,986.72x = 74,154,702.97
  5. Step 5: Solve for x
    x = 74,154,702.97/3,986.72
  6. Step 6: Final answer
    x = 18,600.44

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.