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Finding the Fourth Proportional to 54,213.70, 81,162.15 and 38,661.70

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Solution

The fourth proportional to 54,213.70, 81,162.15 and 38,661.70 is: 57,879.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,213.70 : 81,162.15 = 38,661.70 : x
  2. Step 2: Convert to fraction form
    54,213.70/81,162.15 = 38,661.70/x
  3. Step 3: Cross multiply
    54,213.70x = 81,162.15 × 38,661.70
  4. Step 4: Simplify right side
    54,213.70x = 3,137,866,694.66
  5. Step 5: Solve for x
    x = 3,137,866,694.66/54,213.70
  6. Step 6: Final answer
    x = 57,879.59

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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.