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Finding the Fourth Proportional to 3,890.96, 5,836.72 and 1,425.72

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Solution

The fourth proportional to 3,890.96, 5,836.72 and 1,425.72 is: 2,138.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.96 : 5,836.72 = 1,425.72 : x
  2. Step 2: Convert to fraction form
    3,890.96/5,836.72 = 1,425.72/x
  3. Step 3: Cross multiply
    3,890.96x = 5,836.72 × 1,425.72
  4. Step 4: Simplify right side
    3,890.96x = 8,321,528.44
  5. Step 5: Solve for x
    x = 8,321,528.44/3,890.96
  6. Step 6: Final answer
    x = 2,138.68

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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.