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Finding the Fourth Proportional to 3,874.60, 5,811.90 and 1,930.60

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Solution

The fourth proportional to 3,874.60, 5,811.90 and 1,930.60 is: 2,895.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,874.60 : 5,811.90 = 1,930.60 : x
  2. Step 2: Convert to fraction form
    3,874.60/5,811.90 = 1,930.60/x
  3. Step 3: Cross multiply
    3,874.60x = 5,811.90 × 1,930.60
  4. Step 4: Simplify right side
    3,874.60x = 11,220,454.14
  5. Step 5: Solve for x
    x = 11,220,454.14/3,874.60
  6. Step 6: Final answer
    x = 2,895.90

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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.