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Finding the Fourth Proportional to 54,138.58, 81,169.29 and 20,830.57

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Solution

The fourth proportional to 54,138.58, 81,169.29 and 20,830.57 is: 31,231.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,138.58 : 81,169.29 = 20,830.57 : x
  2. Step 2: Convert to fraction form
    54,138.58/81,169.29 = 20,830.57/x
  3. Step 3: Cross multiply
    54,138.58x = 81,169.29 × 20,830.57
  4. Step 4: Simplify right side
    54,138.58x = 1,690,802,374.27
  5. Step 5: Solve for x
    x = 1,690,802,374.27/54,138.58
  6. Step 6: Final answer
    x = 31,231.01

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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.