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Finding the Fourth Proportional to 391,077.72, 539,694.90 and 255,198.60

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Solution

The fourth proportional to 391,077.72, 539,694.90 and 255,198.60 is: 352,179.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,077.72 : 539,694.90 = 255,198.60 : x
  2. Step 2: Convert to fraction form
    391,077.72/539,694.90 = 255,198.60/x
  3. Step 3: Cross multiply
    391,077.72x = 539,694.90 × 255,198.60
  4. Step 4: Simplify right side
    391,077.72x = 137,729,382,907.14
  5. Step 5: Solve for x
    x = 137,729,382,907.14/391,077.72
  6. Step 6: Final answer
    x = 352,179.06

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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.