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Finding the Fourth Proportional to 54,219.70, 81,291.15 and 20,926.90

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Solution

The fourth proportional to 54,219.70, 81,291.15 and 20,926.90 is: 31,375.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,219.70 : 81,291.15 = 20,926.90 : x
  2. Step 2: Convert to fraction form
    54,219.70/81,291.15 = 20,926.90/x
  3. Step 3: Cross multiply
    54,219.70x = 81,291.15 × 20,926.90
  4. Step 4: Simplify right side
    54,219.70x = 1,701,171,766.94
  5. Step 5: Solve for x
    x = 1,701,171,766.94/54,219.70
  6. Step 6: Final answer
    x = 31,375.53

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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.