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Finding the Fourth Proportional to 39,797.78, 54,921.79 and 21,892.79

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Solution

The fourth proportional to 39,797.78, 54,921.79 and 21,892.79 is: 30,212.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,797.78 : 54,921.79 = 21,892.79 : x
  2. Step 2: Convert to fraction form
    39,797.78/54,921.79 = 21,892.79/x
  3. Step 3: Cross multiply
    39,797.78x = 54,921.79 × 21,892.79
  4. Step 4: Simplify right side
    39,797.78x = 1,202,391,214.89
  5. Step 5: Solve for x
    x = 1,202,391,214.89/39,797.78
  6. Step 6: Final answer
    x = 30,212.52

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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.