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Finding the Fourth Proportional to 381,170.17, 571,662.78 and 128,385.37

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Solution

The fourth proportional to 381,170.17, 571,662.78 and 128,385.37 is: 192,546.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,170.17 : 571,662.78 = 128,385.37 : x
  2. Step 2: Convert to fraction form
    381,170.17/571,662.78 = 128,385.37/x
  3. Step 3: Cross multiply
    381,170.17x = 571,662.78 × 128,385.37
  4. Step 4: Simplify right side
    381,170.17x = 73,393,137,525.53
  5. Step 5: Solve for x
    x = 73,393,137,525.53/381,170.17
  6. Step 6: Final answer
    x = 192,546.91

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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.