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Finding the Fourth Proportional to 128,305.60, 192,093.90 and 121,323.40

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Solution

The fourth proportional to 128,305.60, 192,093.90 and 121,323.40 is: 181,640.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,305.60 : 192,093.90 = 121,323.40 : x
  2. Step 2: Convert to fraction form
    128,305.60/192,093.90 = 121,323.40/x
  3. Step 3: Cross multiply
    128,305.60x = 192,093.90 × 121,323.40
  4. Step 4: Simplify right side
    128,305.60x = 23,305,485,067.26
  5. Step 5: Solve for x
    x = 23,305,485,067.26/128,305.60
  6. Step 6: Final answer
    x = 181,640.44

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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.