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Finding the Fourth Proportional to 3,916, 5,404.26 and 2,147.68

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Solution

The fourth proportional to 3,916, 5,404.26 and 2,147.68 is: 2,963.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,916 : 5,404.26 = 2,147.68 : x
  2. Step 2: Convert to fraction form
    3,916/5,404.26 = 2,147.68/x
  3. Step 3: Cross multiply
    3,916x = 5,404.26 × 2,147.68
  4. Step 4: Simplify right side
    3,916x = 11,606,621.12
  5. Step 5: Solve for x
    x = 11,606,621.12/3,916
  6. Step 6: Final answer
    x = 2,963.90

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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.