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Finding the Fourth Proportional to 85,931.20, 128,896.80 and 80,099.20

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Solution

The fourth proportional to 85,931.20, 128,896.80 and 80,099.20 is: 120,148.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,931.20 : 128,896.80 = 80,099.20 : x
  2. Step 2: Convert to fraction form
    85,931.20/128,896.80 = 80,099.20/x
  3. Step 3: Cross multiply
    85,931.20x = 128,896.80 × 80,099.20
  4. Step 4: Simplify right side
    85,931.20x = 10,324,530,562.56
  5. Step 5: Solve for x
    x = 10,324,530,562.56/85,931.20
  6. Step 6: Final answer
    x = 120,148.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.