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Finding the Fourth Proportional to 3,878.97, 5,355.65 and 3,631.11

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Solution

The fourth proportional to 3,878.97, 5,355.65 and 3,631.11 is: 5,013.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,878.97 : 5,355.65 = 3,631.11 : x
  2. Step 2: Convert to fraction form
    3,878.97/5,355.65 = 3,631.11/x
  3. Step 3: Cross multiply
    3,878.97x = 5,355.65 × 3,631.11
  4. Step 4: Simplify right side
    3,878.97x = 19,446,943.27
  5. Step 5: Solve for x
    x = 19,446,943.27/3,878.97
  6. Step 6: Final answer
    x = 5,013.43

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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.