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Finding the Fourth Proportional to 2,725.92, 4,086 and 1,994.40

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Solution

The fourth proportional to 2,725.92, 4,086 and 1,994.40 is: 2,989.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,725.92 : 4,086 = 1,994.40 : x
  2. Step 2: Convert to fraction form
    2,725.92/4,086 = 1,994.40/x
  3. Step 3: Cross multiply
    2,725.92x = 4,086 × 1,994.40
  4. Step 4: Simplify right side
    2,725.92x = 8,149,118.40
  5. Step 5: Solve for x
    x = 8,149,118.40/2,725.92
  6. Step 6: Final answer
    x = 2,989.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.