Home / 1,861.85-2,790.11-1,338.80

Finding the Fourth Proportional to 1,861.85, 2,790.11 and 1,338.80

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Solution

The fourth proportional to 1,861.85, 2,790.11 and 1,338.80 is: 2,006.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,861.85 : 2,790.11 = 1,338.80 : x
  2. Step 2: Convert to fraction form
    1,861.85/2,790.11 = 1,338.80/x
  3. Step 3: Cross multiply
    1,861.85x = 2,790.11 × 1,338.80
  4. Step 4: Simplify right side
    1,861.85x = 3,735,388.66
  5. Step 5: Solve for x
    x = 3,735,388.66/1,861.85
  6. Step 6: Final answer
    x = 2,006.28

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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.