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Finding the Fourth Proportional to 3,908.78, 5,394.13 and 2,140.55

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Solution

The fourth proportional to 3,908.78, 5,394.13 and 2,140.55 is: 2,953.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,908.78 : 5,394.13 = 2,140.55 : x
  2. Step 2: Convert to fraction form
    3,908.78/5,394.13 = 2,140.55/x
  3. Step 3: Cross multiply
    3,908.78x = 5,394.13 × 2,140.55
  4. Step 4: Simplify right side
    3,908.78x = 11,546,404.97
  5. Step 5: Solve for x
    x = 11,546,404.97/3,908.78
  6. Step 6: Final answer
    x = 2,953.97

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1.5x scale

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.