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Finding the Fourth Proportional to 127,920.72, 191,921.04 and 43,682.88

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Solution

The fourth proportional to 127,920.72, 191,921.04 and 43,682.88 is: 65,537.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,920.72 : 191,921.04 = 43,682.88 : x
  2. Step 2: Convert to fraction form
    127,920.72/191,921.04 = 43,682.88/x
  3. Step 3: Cross multiply
    127,920.72x = 191,921.04 × 43,682.88
  4. Step 4: Simplify right side
    127,920.72x = 8,383,663,759.80
  5. Step 5: Solve for x
    x = 8,383,663,759.80/127,920.72
  6. Step 6: Final answer
    x = 65,537.97

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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.