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Finding the Fourth Proportional to 71,986.60, 107,979.90 and 54,490.60

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Solution

The fourth proportional to 71,986.60, 107,979.90 and 54,490.60 is: 81,735.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,986.60 : 107,979.90 = 54,490.60 : x
  2. Step 2: Convert to fraction form
    71,986.60/107,979.90 = 54,490.60/x
  3. Step 3: Cross multiply
    71,986.60x = 107,979.90 × 54,490.60
  4. Step 4: Simplify right side
    71,986.60x = 5,883,889,538.94
  5. Step 5: Solve for x
    x = 5,883,889,538.94/71,986.60
  6. Step 6: Final answer
    x = 81,735.90

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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.