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Finding the Third Proportional to 4,489 and 9,639.50

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Solution

The third proportional to 4,489 and 9,639.50 is: 20,699.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,489 : 9,639.50 = 9,639.50 : x
  2. Step 2: Convert to fraction form
    4,489/9,639.50 = 9,639.50/x
  3. Step 3: Cross multiply
    4,489x = 9,639.50 × 9,639.50
  4. Step 4: Simplify right side
    4,489x = 92,919,960.25
  5. Step 5: Solve for x
    x = 92,919,960.25/4,489
  6. Step 6: Final answer
    x = 20,699.48

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.