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Finding the Fourth Proportional to 54,228.70, 81,355.20 and 20,945.80

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Solution

The fourth proportional to 54,228.70, 81,355.20 and 20,945.80 is: 31,423.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,228.70 : 81,355.20 = 20,945.80 : x
  2. Step 2: Convert to fraction form
    54,228.70/81,355.20 = 20,945.80/x
  3. Step 3: Cross multiply
    54,228.70x = 81,355.20 × 20,945.80
  4. Step 4: Simplify right side
    54,228.70x = 1,704,049,748.16
  5. Step 5: Solve for x
    x = 1,704,049,748.16/54,228.70
  6. Step 6: Final answer
    x = 31,423.39

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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.