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Finding the Fourth Proportional to 81,087.20, 121,339.20 and 54,843.20

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Solution

The fourth proportional to 81,087.20, 121,339.20 and 54,843.20 is: 82,067.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,087.20 : 121,339.20 = 54,843.20 : x
  2. Step 2: Convert to fraction form
    81,087.20/121,339.20 = 54,843.20/x
  3. Step 3: Cross multiply
    81,087.20x = 121,339.20 × 54,843.20
  4. Step 4: Simplify right side
    81,087.20x = 6,654,630,013.44
  5. Step 5: Solve for x
    x = 6,654,630,013.44/81,087.20
  6. Step 6: Final answer
    x = 82,067.58

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1.5x scale

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.