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Finding the Fourth Proportional to 39,776.58, 54,891.92 and 21,871.73

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Solution

The fourth proportional to 39,776.58, 54,891.92 and 21,871.73 is: 30,183.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,776.58 : 54,891.92 = 21,871.73 : x
  2. Step 2: Convert to fraction form
    39,776.58/54,891.92 = 21,871.73/x
  3. Step 3: Cross multiply
    39,776.58x = 54,891.92 × 21,871.73
  4. Step 4: Simplify right side
    39,776.58x = 1,200,581,445.33
  5. Step 5: Solve for x
    x = 1,200,581,445.33/39,776.58
  6. Step 6: Final answer
    x = 30,183.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.