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Finding the Fourth Proportional to 139,593.25, 192,638.78 and 79,144.57

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Solution

The fourth proportional to 139,593.25, 192,638.78 and 79,144.57 is: 109,219.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,593.25 : 192,638.78 = 79,144.57 : x
  2. Step 2: Convert to fraction form
    139,593.25/192,638.78 = 79,144.57/x
  3. Step 3: Cross multiply
    139,593.25x = 192,638.78 × 79,144.57
  4. Step 4: Simplify right side
    139,593.25x = 15,246,313,408.42
  5. Step 5: Solve for x
    x = 15,246,313,408.42/139,593.25
  6. Step 6: Final answer
    x = 109,219.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.