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Finding the Fourth Proportional to 128,539.70, 192,728.55 and 53,711.90

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Solution

The fourth proportional to 128,539.70, 192,728.55 and 53,711.90 is: 80,534.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,539.70 : 192,728.55 = 53,711.90 : x
  2. Step 2: Convert to fraction form
    128,539.70/192,728.55 = 53,711.90/x
  3. Step 3: Cross multiply
    128,539.70x = 192,728.55 × 53,711.90
  4. Step 4: Simplify right side
    128,539.70x = 10,351,816,604.75
  5. Step 5: Solve for x
    x = 10,351,816,604.75/128,539.70
  6. Step 6: Final answer
    x = 80,534.00

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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.