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Finding the Fourth Proportional to 79,469.87, 109,678.92 and 51,257.57

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Solution

The fourth proportional to 79,469.87, 109,678.92 and 51,257.57 is: 70,742.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,469.87 : 109,678.92 = 51,257.57 : x
  2. Step 2: Convert to fraction form
    79,469.87/109,678.92 = 51,257.57/x
  3. Step 3: Cross multiply
    79,469.87x = 109,678.92 × 51,257.57
  4. Step 4: Simplify right side
    79,469.87x = 5,621,874,919.42
  5. Step 5: Solve for x
    x = 5,621,874,919.42/79,469.87
  6. Step 6: Final answer
    x = 70,742.22

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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.