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Finding the Fourth Proportional to 128,238.84, 192,380.28 and 57,186.72

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Solution

The fourth proportional to 128,238.84, 192,380.28 and 57,186.72 is: 85,789.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,238.84 : 192,380.28 = 57,186.72 : x
  2. Step 2: Convert to fraction form
    128,238.84/192,380.28 = 57,186.72/x
  3. Step 3: Cross multiply
    128,238.84x = 192,380.28 × 57,186.72
  4. Step 4: Simplify right side
    128,238.84x = 11,001,597,205.88
  5. Step 5: Solve for x
    x = 11,001,597,205.88/128,238.84
  6. Step 6: Final answer
    x = 85,789.90

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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.