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Finding the Third Proportional to 10,661 and 19,989

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Solution

The third proportional to 10,661 and 19,989 is: 37,478.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,661 : 19,989 = 19,989 : x
  2. Step 2: Convert to fraction form
    10,661/19,989 = 19,989/x
  3. Step 3: Cross multiply
    10,661x = 19,989 × 19,989
  4. Step 4: Simplify right side
    10,661x = 399,560,121
  5. Step 5: Solve for x
    x = 399,560,121/10,661
  6. Step 6: Final answer
    x = 37,478.67

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Why These Related Problems?

These problems maintain the same ratio (1.87) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.