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Finding the Third Proportional to 7,919 and 11,931

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Solution

The third proportional to 7,919 and 11,931 is: 17,975.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,919 : 11,931 = 11,931 : x
  2. Step 2: Convert to fraction form
    7,919/11,931 = 11,931/x
  3. Step 3: Cross multiply
    7,919x = 11,931 × 11,931
  4. Step 4: Simplify right side
    7,919x = 142,348,761
  5. Step 5: Solve for x
    x = 142,348,761/7,919
  6. Step 6: Final answer
    x = 17,975.60

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.