Home / 81,423.20-122,163.60-78,543.20

Finding the Fourth Proportional to 81,423.20, 122,163.60 and 78,543.20

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Solution

The fourth proportional to 81,423.20, 122,163.60 and 78,543.20 is: 117,842.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,423.20 : 122,163.60 = 78,543.20 : x
  2. Step 2: Convert to fraction form
    81,423.20/122,163.60 = 78,543.20/x
  3. Step 3: Cross multiply
    81,423.20x = 122,163.60 × 78,543.20
  4. Step 4: Simplify right side
    81,423.20x = 9,595,120,067.52
  5. Step 5: Solve for x
    x = 9,595,120,067.52/81,423.20
  6. Step 6: Final answer
    x = 117,842.58

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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.