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Finding the Third Proportional to 5,402 and 7,679

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Solution

The third proportional to 5,402 and 7,679 is: 10,915.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,402 : 7,679 = 7,679 : x
  2. Step 2: Convert to fraction form
    5,402/7,679 = 7,679/x
  3. Step 3: Cross multiply
    5,402x = 7,679 × 7,679
  4. Step 4: Simplify right side
    5,402x = 58,967,041
  5. Step 5: Solve for x
    x = 58,967,041/5,402
  6. Step 6: Final answer
    x = 10,915.78

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.