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Finding the Fourth Proportional to 1,995.78, 2,998.26 and 1,257.70

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Solution

The fourth proportional to 1,995.78, 2,998.26 and 1,257.70 is: 1,889.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,995.78 : 2,998.26 = 1,257.70 : x
  2. Step 2: Convert to fraction form
    1,995.78/2,998.26 = 1,257.70/x
  3. Step 3: Cross multiply
    1,995.78x = 2,998.26 × 1,257.70
  4. Step 4: Simplify right side
    1,995.78x = 3,770,911.60
  5. Step 5: Solve for x
    x = 3,770,911.60/1,995.78
  6. Step 6: Final answer
    x = 1,889.44

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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.