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Finding the Fourth Proportional to 279,659.70, 419,489.55 and 79,986.60

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Solution

The fourth proportional to 279,659.70, 419,489.55 and 79,986.60 is: 119,979.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,659.70 : 419,489.55 = 79,986.60 : x
  2. Step 2: Convert to fraction form
    279,659.70/419,489.55 = 79,986.60/x
  3. Step 3: Cross multiply
    279,659.70x = 419,489.55 × 79,986.60
  4. Step 4: Simplify right side
    279,659.70x = 33,553,542,840.03
  5. Step 5: Solve for x
    x = 33,553,542,840.03/279,659.70
  6. Step 6: Final answer
    x = 119,979.90

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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.