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Finding the Third Proportional to 7,138 and 11,139

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Solution

The third proportional to 7,138 and 11,139 is: 17,382.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,138 : 11,139 = 11,139 : x
  2. Step 2: Convert to fraction form
    7,138/11,139 = 11,139/x
  3. Step 3: Cross multiply
    7,138x = 11,139 × 11,139
  4. Step 4: Simplify right side
    7,138x = 124,077,321
  5. Step 5: Solve for x
    x = 124,077,321/7,138
  6. Step 6: Final answer
    x = 17,382.65

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.