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Finding the Fourth Proportional to 2,490.86, 3,728.39 and 1,391.90

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Solution

The fourth proportional to 2,490.86, 3,728.39 and 1,391.90 is: 2,083.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,490.86 : 3,728.39 = 1,391.90 : x
  2. Step 2: Convert to fraction form
    2,490.86/3,728.39 = 1,391.90/x
  3. Step 3: Cross multiply
    2,490.86x = 3,728.39 × 1,391.90
  4. Step 4: Simplify right side
    2,490.86x = 5,189,520.44
  5. Step 5: Solve for x
    x = 5,189,520.44/2,490.86
  6. Step 6: Final answer
    x = 2,083.43

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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.