Home / 280,836.80-421,255.20-81,163.70

Finding the Fourth Proportional to 280,836.80, 421,255.20 and 81,163.70

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Solution

The fourth proportional to 280,836.80, 421,255.20 and 81,163.70 is: 121,745.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,836.80 : 421,255.20 = 81,163.70 : x
  2. Step 2: Convert to fraction form
    280,836.80/421,255.20 = 81,163.70/x
  3. Step 3: Cross multiply
    280,836.80x = 421,255.20 × 81,163.70
  4. Step 4: Simplify right side
    280,836.80x = 34,190,630,676.24
  5. Step 5: Solve for x
    x = 34,190,630,676.24/280,836.80
  6. Step 6: Final answer
    x = 121,745.55

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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.