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Finding the Fourth Proportional to 128,671.56, 192,939.84 and 53,777.88

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Solution

The fourth proportional to 128,671.56, 192,939.84 and 53,777.88 is: 80,638.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,671.56 : 192,939.84 = 53,777.88 : x
  2. Step 2: Convert to fraction form
    128,671.56/192,939.84 = 53,777.88/x
  3. Step 3: Cross multiply
    128,671.56x = 192,939.84 × 53,777.88
  4. Step 4: Simplify right side
    128,671.56x = 10,375,895,562.74
  5. Step 5: Solve for x
    x = 10,375,895,562.74/128,671.56
  6. Step 6: Final answer
    x = 80,638.61

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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.