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Finding the Fourth Proportional to 381,939.44, 572,894.57 and 129,238.88

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Solution

The fourth proportional to 381,939.44, 572,894.57 and 129,238.88 is: 193,853.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,939.44 : 572,894.57 = 129,238.88 : x
  2. Step 2: Convert to fraction form
    381,939.44/572,894.57 = 129,238.88/x
  3. Step 3: Cross multiply
    381,939.44x = 572,894.57 × 129,238.88
  4. Step 4: Simplify right side
    381,939.44x = 74,040,250,043.51
  5. Step 5: Solve for x
    x = 74,040,250,043.51/381,939.44
  6. Step 6: Final answer
    x = 193,853.38

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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.