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Finding the Fourth Proportional to 128,917.20, 193,222.20 and 54,037.20

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Solution

The fourth proportional to 128,917.20, 193,222.20 and 54,037.20 is: 80,991.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,917.20 : 193,222.20 = 54,037.20 : x
  2. Step 2: Convert to fraction form
    128,917.20/193,222.20 = 54,037.20/x
  3. Step 3: Cross multiply
    128,917.20x = 193,222.20 × 54,037.20
  4. Step 4: Simplify right side
    128,917.20x = 10,441,186,665.84
  5. Step 5: Solve for x
    x = 10,441,186,665.84/128,917.20
  6. Step 6: Final answer
    x = 80,991.42

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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.