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Finding the Fourth Proportional to 3,986.70, 5,502.41 and 2,639.94

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Solution

The fourth proportional to 3,986.70, 5,502.41 and 2,639.94 is: 3,643.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.70 : 5,502.41 = 2,639.94 : x
  2. Step 2: Convert to fraction form
    3,986.70/5,502.41 = 2,639.94/x
  3. Step 3: Cross multiply
    3,986.70x = 5,502.41 × 2,639.94
  4. Step 4: Simplify right side
    3,986.70x = 14,525,998.14
  5. Step 5: Solve for x
    x = 14,525,998.14/3,986.70
  6. Step 6: Final answer
    x = 3,643.61

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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.