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Finding the Fourth Proportional to 2,786.20, 4,171.20 and 2,705.20

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Solution

The fourth proportional to 2,786.20, 4,171.20 and 2,705.20 is: 4,049.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,786.20 : 4,171.20 = 2,705.20 : x
  2. Step 2: Convert to fraction form
    2,786.20/4,171.20 = 2,705.20/x
  3. Step 3: Cross multiply
    2,786.20x = 4,171.20 × 2,705.20
  4. Step 4: Simplify right side
    2,786.20x = 11,283,930.24
  5. Step 5: Solve for x
    x = 11,283,930.24/2,786.20
  6. Step 6: Final answer
    x = 4,049.94

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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.