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Finding the Fourth Proportional to 128,469.60, 192,704.40 and 123,220.80

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Solution

The fourth proportional to 128,469.60, 192,704.40 and 123,220.80 is: 184,831.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,469.60 : 192,704.40 = 123,220.80 : x
  2. Step 2: Convert to fraction form
    128,469.60/192,704.40 = 123,220.80/x
  3. Step 3: Cross multiply
    128,469.60x = 192,704.40 × 123,220.80
  4. Step 4: Simplify right side
    128,469.60x = 23,745,190,331.52
  5. Step 5: Solve for x
    x = 23,745,190,331.52/128,469.60
  6. Step 6: Final answer
    x = 184,831.20

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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.