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Finding the Third Proportional to 7,120 and 12,138

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Solution

The third proportional to 7,120 and 12,138 is: 20,692.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,120 : 12,138 = 12,138 : x
  2. Step 2: Convert to fraction form
    7,120/12,138 = 12,138/x
  3. Step 3: Cross multiply
    7,120x = 12,138 × 12,138
  4. Step 4: Simplify right side
    7,120x = 147,331,044
  5. Step 5: Solve for x
    x = 147,331,044/7,120
  6. Step 6: Final answer
    x = 20,692.56

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Why These Related Problems?

These problems maintain the same ratio (1.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.