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Finding the Third Proportional to 9,921 and 13,606.50

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Solution

The third proportional to 9,921 and 13,606.50 is: 18,661.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,921 : 13,606.50 = 13,606.50 : x
  2. Step 2: Convert to fraction form
    9,921/13,606.50 = 13,606.50/x
  3. Step 3: Cross multiply
    9,921x = 13,606.50 × 13,606.50
  4. Step 4: Simplify right side
    9,921x = 185,136,842.25
  5. Step 5: Solve for x
    x = 185,136,842.25/9,921
  6. Step 6: Final answer
    x = 18,661.11

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.