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Finding the Fourth Proportional to 71,912.97, 99,245.52 and 39,653.28

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Solution

The fourth proportional to 71,912.97, 99,245.52 and 39,653.28 is: 54,724.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,912.97 : 99,245.52 = 39,653.28 : x
  2. Step 2: Convert to fraction form
    71,912.97/99,245.52 = 39,653.28/x
  3. Step 3: Cross multiply
    71,912.97x = 99,245.52 × 39,653.28
  4. Step 4: Simplify right side
    71,912.97x = 3,935,410,393.31
  5. Step 5: Solve for x
    x = 3,935,410,393.31/71,912.97
  6. Step 6: Final answer
    x = 54,724.63

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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.