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Finding the Fourth Proportional to 128,563.20, 192,844.80 and 39,843.90

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Solution

The fourth proportional to 128,563.20, 192,844.80 and 39,843.90 is: 59,765.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,563.20 : 192,844.80 = 39,843.90 : x
  2. Step 2: Convert to fraction form
    128,563.20/192,844.80 = 39,843.90/x
  3. Step 3: Cross multiply
    128,563.20x = 192,844.80 × 39,843.90
  4. Step 4: Simplify right side
    128,563.20x = 7,683,688,926.72
  5. Step 5: Solve for x
    x = 7,683,688,926.72/128,563.20
  6. Step 6: Final answer
    x = 59,765.85

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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.