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Finding the Fourth Proportional to 100,811.20, 139,110.42 and 58,372.60

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Solution

The fourth proportional to 100,811.20, 139,110.42 and 58,372.60 is: 80,548.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,811.20 : 139,110.42 = 58,372.60 : x
  2. Step 2: Convert to fraction form
    100,811.20/139,110.42 = 58,372.60/x
  3. Step 3: Cross multiply
    100,811.20x = 139,110.42 × 58,372.60
  4. Step 4: Simplify right side
    100,811.20x = 8,120,236,902.49
  5. Step 5: Solve for x
    x = 8,120,236,902.49/100,811.20
  6. Step 6: Final answer
    x = 80,548.96

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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.