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Finding the Fourth Proportional to 128,186.72, 192,143.92 and 75,620.96

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Solution

The fourth proportional to 128,186.72, 192,143.92 and 75,620.96 is: 113,351.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,186.72 : 192,143.92 = 75,620.96 : x
  2. Step 2: Convert to fraction form
    128,186.72/192,143.92 = 75,620.96/x
  3. Step 3: Cross multiply
    128,186.72x = 192,143.92 × 75,620.96
  4. Step 4: Simplify right side
    128,186.72x = 14,530,107,688.56
  5. Step 5: Solve for x
    x = 14,530,107,688.56/128,186.72
  6. Step 6: Final answer
    x = 113,351.12

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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.