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Finding the Fourth Proportional to 2,679, 4,016.76 and 1,120.05

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Solution

The fourth proportional to 2,679, 4,016.76 and 1,120.05 is: 1,679.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,679 : 4,016.76 = 1,120.05 : x
  2. Step 2: Convert to fraction form
    2,679/4,016.76 = 1,120.05/x
  3. Step 3: Cross multiply
    2,679x = 4,016.76 × 1,120.05
  4. Step 4: Simplify right side
    2,679x = 4,498,972.04
  5. Step 5: Solve for x
    x = 4,498,972.04/2,679
  6. Step 6: Final answer
    x = 1,679.35

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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.