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Finding the Fourth Proportional to 128,439.80, 192,414.90 and 69,255.80

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Solution

The fourth proportional to 128,439.80, 192,414.90 and 69,255.80 is: 103,751.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,439.80 : 192,414.90 = 69,255.80 : x
  2. Step 2: Convert to fraction form
    128,439.80/192,414.90 = 69,255.80/x
  3. Step 3: Cross multiply
    128,439.80x = 192,414.90 × 69,255.80
  4. Step 4: Simplify right side
    128,439.80x = 13,325,847,831.42
  5. Step 5: Solve for x
    x = 13,325,847,831.42/128,439.80
  6. Step 6: Final answer
    x = 103,751.70

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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.