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Finding the Fourth Proportional to 2,747.80, 4,121.70 and 2,091.70

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Solution

The fourth proportional to 2,747.80, 4,121.70 and 2,091.70 is: 3,137.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,747.80 : 4,121.70 = 2,091.70 : x
  2. Step 2: Convert to fraction form
    2,747.80/4,121.70 = 2,091.70/x
  3. Step 3: Cross multiply
    2,747.80x = 4,121.70 × 2,091.70
  4. Step 4: Simplify right side
    2,747.80x = 8,621,359.89
  5. Step 5: Solve for x
    x = 8,621,359.89/2,747.80
  6. Step 6: Final answer
    x = 3,137.55

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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.