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Finding the Fourth Proportional to 54,105.20, 81,119.40 and 20,812.40

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Solution

The fourth proportional to 54,105.20, 81,119.40 and 20,812.40 is: 31,203.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,105.20 : 81,119.40 = 20,812.40 : x
  2. Step 2: Convert to fraction form
    54,105.20/81,119.40 = 20,812.40/x
  3. Step 3: Cross multiply
    54,105.20x = 81,119.40 × 20,812.40
  4. Step 4: Simplify right side
    54,105.20x = 1,688,289,400.56
  5. Step 5: Solve for x
    x = 1,688,289,400.56/54,105.20
  6. Step 6: Final answer
    x = 31,203.83

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.