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Finding the Fourth Proportional to 2,679, 4,020.66 and 1,380.84

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Solution

The fourth proportional to 2,679, 4,020.66 and 1,380.84 is: 2,072.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,679 : 4,020.66 = 1,380.84 : x
  2. Step 2: Convert to fraction form
    2,679/4,020.66 = 1,380.84/x
  3. Step 3: Cross multiply
    2,679x = 4,020.66 × 1,380.84
  4. Step 4: Simplify right side
    2,679x = 5,551,888.15
  5. Step 5: Solve for x
    x = 5,551,888.15/2,679
  6. Step 6: Final answer
    x = 2,072.37

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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.