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Finding the Third Proportional to 7,938 and 12,318

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Solution

The third proportional to 7,938 and 12,318 is: 19,114.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,938 : 12,318 = 12,318 : x
  2. Step 2: Convert to fraction form
    7,938/12,318 = 12,318/x
  3. Step 3: Cross multiply
    7,938x = 12,318 × 12,318
  4. Step 4: Simplify right side
    7,938x = 151,733,124
  5. Step 5: Solve for x
    x = 151,733,124/7,938
  6. Step 6: Final answer
    x = 19,114.78

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.