Home / 280,105.20-419,807.40-139,902.96

Finding the Fourth Proportional to 280,105.20, 419,807.40 and 139,902.96

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Solution

The fourth proportional to 280,105.20, 419,807.40 and 139,902.96 is: 209,679.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,105.20 : 419,807.40 = 139,902.96 : x
  2. Step 2: Convert to fraction form
    280,105.20/419,807.40 = 139,902.96/x
  3. Step 3: Cross multiply
    280,105.20x = 419,807.40 × 139,902.96
  4. Step 4: Simplify right side
    280,105.20x = 58,732,297,889.90
  5. Step 5: Solve for x
    x = 58,732,297,889.90/280,105.20
  6. Step 6: Final answer
    x = 209,679.43

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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.