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Finding the Fourth Proportional to 2,891.79, 3,990.39 and 2,135.97

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Solution

The fourth proportional to 2,891.79, 3,990.39 and 2,135.97 is: 2,947.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,891.79 : 3,990.39 = 2,135.97 : x
  2. Step 2: Convert to fraction form
    2,891.79/3,990.39 = 2,135.97/x
  3. Step 3: Cross multiply
    2,891.79x = 3,990.39 × 2,135.97
  4. Step 4: Simplify right side
    2,891.79x = 8,523,353.33
  5. Step 5: Solve for x
    x = 8,523,353.33/2,891.79
  6. Step 6: Final answer
    x = 2,947.43

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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.