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Finding the Fourth Proportional to 3,889.98, 5,369.19 and 2,491.98

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Solution

The fourth proportional to 3,889.98, 5,369.19 and 2,491.98 is: 3,439.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,889.98 : 5,369.19 = 2,491.98 : x
  2. Step 2: Convert to fraction form
    3,889.98/5,369.19 = 2,491.98/x
  3. Step 3: Cross multiply
    3,889.98x = 5,369.19 × 2,491.98
  4. Step 4: Simplify right side
    3,889.98x = 13,379,914.10
  5. Step 5: Solve for x
    x = 13,379,914.10/3,889.98
  6. Step 6: Final answer
    x = 3,439.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.