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Finding the Fourth Proportional to 39,695.92, 54,780.53 and 21,791.22

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Solution

The fourth proportional to 39,695.92, 54,780.53 and 21,791.22 is: 30,071.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,695.92 : 54,780.53 = 21,791.22 : x
  2. Step 2: Convert to fraction form
    39,695.92/54,780.53 = 21,791.22/x
  3. Step 3: Cross multiply
    39,695.92x = 54,780.53 × 21,791.22
  4. Step 4: Simplify right side
    39,695.92x = 1,193,734,471.99
  5. Step 5: Solve for x
    x = 1,193,734,471.99/39,695.92
  6. Step 6: Final answer
    x = 30,071.97

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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.