Home / 128,439.20-192,399.60-89,040.80

Finding the Fourth Proportional to 128,439.20, 192,399.60 and 89,040.80

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Solution

The fourth proportional to 128,439.20, 192,399.60 and 89,040.80 is: 133,381.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,439.20 : 192,399.60 = 89,040.80 : x
  2. Step 2: Convert to fraction form
    128,439.20/192,399.60 = 89,040.80/x
  3. Step 3: Cross multiply
    128,439.20x = 192,399.60 × 89,040.80
  4. Step 4: Simplify right side
    128,439.20x = 17,131,414,303.68
  5. Step 5: Solve for x
    x = 17,131,414,303.68/128,439.20
  6. Step 6: Final answer
    x = 133,381.51

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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.