Home / 1,239.61-1,861.98-1,198.09

Finding the Fourth Proportional to 1,239.61, 1,861.98 and 1,198.09

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Solution

The fourth proportional to 1,239.61, 1,861.98 and 1,198.09 is: 1,799.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.61 : 1,861.98 = 1,198.09 : x
  2. Step 2: Convert to fraction form
    1,239.61/1,861.98 = 1,198.09/x
  3. Step 3: Cross multiply
    1,239.61x = 1,861.98 × 1,198.09
  4. Step 4: Simplify right side
    1,239.61x = 2,230,819.62
  5. Step 5: Solve for x
    x = 2,230,819.62/1,239.61
  6. Step 6: Final answer
    x = 1,799.61

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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.