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Finding the Fourth Proportional to 2,745.90, 4,118.31 and 990.54

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Solution

The fourth proportional to 2,745.90, 4,118.31 and 990.54 is: 1,485.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,745.90 : 4,118.31 = 990.54 : x
  2. Step 2: Convert to fraction form
    2,745.90/4,118.31 = 990.54/x
  3. Step 3: Cross multiply
    2,745.90x = 4,118.31 × 990.54
  4. Step 4: Simplify right side
    2,745.90x = 4,079,350.79
  5. Step 5: Solve for x
    x = 4,079,350.79/2,745.90
  6. Step 6: Final answer
    x = 1,485.62

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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.