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Finding the Fourth Proportional to 54,215.70, 81,335.70 and 20,932.80

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Solution

The fourth proportional to 54,215.70, 81,335.70 and 20,932.80 is: 31,403.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,215.70 : 81,335.70 = 20,932.80 : x
  2. Step 2: Convert to fraction form
    54,215.70/81,335.70 = 20,932.80/x
  3. Step 3: Cross multiply
    54,215.70x = 81,335.70 × 20,932.80
  4. Step 4: Simplify right side
    54,215.70x = 1,702,583,940.96
  5. Step 5: Solve for x
    x = 1,702,583,940.96/54,215.70
  6. Step 6: Final answer
    x = 31,403.89

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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.