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Finding the Fourth Proportional to 128,311.20, 192,409.20 and 49,399.20

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Solution

The fourth proportional to 128,311.20, 192,409.20 and 49,399.20 is: 74,076.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,311.20 : 192,409.20 = 49,399.20 : x
  2. Step 2: Convert to fraction form
    128,311.20/192,409.20 = 49,399.20/x
  3. Step 3: Cross multiply
    128,311.20x = 192,409.20 × 49,399.20
  4. Step 4: Simplify right side
    128,311.20x = 9,504,860,552.64
  5. Step 5: Solve for x
    x = 9,504,860,552.64/128,311.20
  6. Step 6: Final answer
    x = 74,076.62

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1.5x scale

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.