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Finding the Fourth Proportional to 3,963.78, 5,471.22 and 2,918.88

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Solution

The fourth proportional to 3,963.78, 5,471.22 and 2,918.88 is: 4,028.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,963.78 : 5,471.22 = 2,918.88 : x
  2. Step 2: Convert to fraction form
    3,963.78/5,471.22 = 2,918.88/x
  3. Step 3: Cross multiply
    3,963.78x = 5,471.22 × 2,918.88
  4. Step 4: Simplify right side
    3,963.78x = 15,969,834.63
  5. Step 5: Solve for x
    x = 15,969,834.63/3,963.78
  6. Step 6: Final answer
    x = 4,028.94

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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.