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Finding the Fourth Proportional to 3,876.70, 5,813.31 and 1,243.72

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Solution

The fourth proportional to 3,876.70, 5,813.31 and 1,243.72 is: 1,865.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,876.70 : 5,813.31 = 1,243.72 : x
  2. Step 2: Convert to fraction form
    3,876.70/5,813.31 = 1,243.72/x
  3. Step 3: Cross multiply
    3,876.70x = 5,813.31 × 1,243.72
  4. Step 4: Simplify right side
    3,876.70x = 7,230,129.91
  5. Step 5: Solve for x
    x = 7,230,129.91/3,876.70
  6. Step 6: Final answer
    x = 1,865.02

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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.