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Finding the Third Proportional to 12,121.50 and 17,781

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Solution

The third proportional to 12,121.50 and 17,781 is: 26,082.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,121.50 : 17,781 = 17,781 : x
  2. Step 2: Convert to fraction form
    12,121.50/17,781 = 17,781/x
  3. Step 3: Cross multiply
    12,121.50x = 17,781 × 17,781
  4. Step 4: Simplify right side
    12,121.50x = 316,163,961
  5. Step 5: Solve for x
    x = 316,163,961/12,121.50
  6. Step 6: Final answer
    x = 26,082.91

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.