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Finding the Fourth Proportional to 3,969, 5,475.33 and 2,790.72

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Solution

The fourth proportional to 3,969, 5,475.33 and 2,790.72 is: 3,849.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,969 : 5,475.33 = 2,790.72 : x
  2. Step 2: Convert to fraction form
    3,969/5,475.33 = 2,790.72/x
  3. Step 3: Cross multiply
    3,969x = 5,475.33 × 2,790.72
  4. Step 4: Simplify right side
    3,969x = 15,280,112.94
  5. Step 5: Solve for x
    x = 15,280,112.94/3,969
  6. Step 6: Final answer
    x = 3,849.86

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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.