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Finding the Fourth Proportional to 126,879.16, 190,321.84 and 42,640.56

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Solution

The fourth proportional to 126,879.16, 190,321.84 and 42,640.56 is: 63,961.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,879.16 : 190,321.84 = 42,640.56 : x
  2. Step 2: Convert to fraction form
    126,879.16/190,321.84 = 42,640.56/x
  3. Step 3: Cross multiply
    126,879.16x = 190,321.84 × 42,640.56
  4. Step 4: Simplify right side
    126,879.16x = 8,115,429,837.83
  5. Step 5: Solve for x
    x = 8,115,429,837.83/126,879.16
  6. Step 6: Final answer
    x = 63,961.88

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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.