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Finding the Third Proportional to 7,779 and 12,372

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Solution

The third proportional to 7,779 and 12,372 is: 19,676.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,779 : 12,372 = 12,372 : x
  2. Step 2: Convert to fraction form
    7,779/12,372 = 12,372/x
  3. Step 3: Cross multiply
    7,779x = 12,372 × 12,372
  4. Step 4: Simplify right side
    7,779x = 153,066,384
  5. Step 5: Solve for x
    x = 153,066,384/7,779
  6. Step 6: Final answer
    x = 19,676.87

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.