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Finding the Fourth Proportional to 3,891.94, 5,371.32 and 2,167.40

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Solution

The fourth proportional to 3,891.94, 5,371.32 and 2,167.40 is: 2,991.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.94 : 5,371.32 = 2,167.40 : x
  2. Step 2: Convert to fraction form
    3,891.94/5,371.32 = 2,167.40/x
  3. Step 3: Cross multiply
    3,891.94x = 5,371.32 × 2,167.40
  4. Step 4: Simplify right side
    3,891.94x = 11,641,798.97
  5. Step 5: Solve for x
    x = 11,641,798.97/3,891.94
  6. Step 6: Final answer
    x = 2,991.26

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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.