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Finding the Third Proportional to 3,687 and 8,815.50

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Solution

The third proportional to 3,687 and 8,815.50 is: 21,077.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,687 : 8,815.50 = 8,815.50 : x
  2. Step 2: Convert to fraction form
    3,687/8,815.50 = 8,815.50/x
  3. Step 3: Cross multiply
    3,687x = 8,815.50 × 8,815.50
  4. Step 4: Simplify right side
    3,687x = 77,713,040.25
  5. Step 5: Solve for x
    x = 77,713,040.25/3,687
  6. Step 6: Final answer
    x = 21,077.58

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Why These Related Problems?

These problems maintain the same ratio (2.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.