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Finding the Fourth Proportional to 2,586.72, 3,879.90 and 855.24

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Solution

The fourth proportional to 2,586.72, 3,879.90 and 855.24 is: 1,282.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,586.72 : 3,879.90 = 855.24 : x
  2. Step 2: Convert to fraction form
    2,586.72/3,879.90 = 855.24/x
  3. Step 3: Cross multiply
    2,586.72x = 3,879.90 × 855.24
  4. Step 4: Simplify right side
    2,586.72x = 3,318,245.68
  5. Step 5: Solve for x
    x = 3,318,245.68/2,586.72
  6. Step 6: Final answer
    x = 1,282.80

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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.