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Finding the Fourth Proportional to 100,764.72, 139,040.64 and 60,469.92

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Solution

The fourth proportional to 100,764.72, 139,040.64 and 60,469.92 is: 83,439.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,764.72 : 139,040.64 = 60,469.92 : x
  2. Step 2: Convert to fraction form
    100,764.72/139,040.64 = 60,469.92/x
  3. Step 3: Cross multiply
    100,764.72x = 139,040.64 × 60,469.92
  4. Step 4: Simplify right side
    100,764.72x = 8,407,776,377.55
  5. Step 5: Solve for x
    x = 8,407,776,377.55/100,764.72
  6. Step 6: Final answer
    x = 83,439.68

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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.