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Finding the Fourth Proportional to 128,630.80, 192,936.60 and 53,731.60

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Solution

The fourth proportional to 128,630.80, 192,936.60 and 53,731.60 is: 80,593.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,630.80 : 192,936.60 = 53,731.60 : x
  2. Step 2: Convert to fraction form
    128,630.80/192,936.60 = 53,731.60/x
  3. Step 3: Cross multiply
    128,630.80x = 192,936.60 × 53,731.60
  4. Step 4: Simplify right side
    128,630.80x = 10,366,792,216.56
  5. Step 5: Solve for x
    x = 10,366,792,216.56/128,630.80
  6. Step 6: Final answer
    x = 80,593.39

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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.