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Finding the Fourth Proportional to 54,532.70, 81,811.20 and 21,249.80

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Solution

The fourth proportional to 54,532.70, 81,811.20 and 21,249.80 is: 31,879.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,532.70 : 81,811.20 = 21,249.80 : x
  2. Step 2: Convert to fraction form
    54,532.70/81,811.20 = 21,249.80/x
  3. Step 3: Cross multiply
    54,532.70x = 81,811.20 × 21,249.80
  4. Step 4: Simplify right side
    54,532.70x = 1,738,471,637.76
  5. Step 5: Solve for x
    x = 1,738,471,637.76/54,532.70
  6. Step 6: Final answer
    x = 31,879.43

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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.