Home / 80,619.20-120,928.80-78,891.20

Finding the Fourth Proportional to 80,619.20, 120,928.80 and 78,891.20

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Solution

The fourth proportional to 80,619.20, 120,928.80 and 78,891.20 is: 118,336.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,619.20 : 120,928.80 = 78,891.20 : x
  2. Step 2: Convert to fraction form
    80,619.20/120,928.80 = 78,891.20/x
  3. Step 3: Cross multiply
    80,619.20x = 120,928.80 × 78,891.20
  4. Step 4: Simplify right side
    80,619.20x = 9,540,218,146.56
  5. Step 5: Solve for x
    x = 9,540,218,146.56/80,619.20
  6. Step 6: Final answer
    x = 118,336.80

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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.