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Finding the Third Proportional to 12,139.50 and 18,135

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Solution

The third proportional to 12,139.50 and 18,135 is: 27,091.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,139.50 : 18,135 = 18,135 : x
  2. Step 2: Convert to fraction form
    12,139.50/18,135 = 18,135/x
  3. Step 3: Cross multiply
    12,139.50x = 18,135 × 18,135
  4. Step 4: Simplify right side
    12,139.50x = 328,878,225
  5. Step 5: Solve for x
    x = 328,878,225/12,139.50
  6. Step 6: Final answer
    x = 27,091.58

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.