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Finding the Fourth Proportional to 1,992.78, 2,991.60 and 1,171.44

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Solution

The fourth proportional to 1,992.78, 2,991.60 and 1,171.44 is: 1,758.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,992.78 : 2,991.60 = 1,171.44 : x
  2. Step 2: Convert to fraction form
    1,992.78/2,991.60 = 1,171.44/x
  3. Step 3: Cross multiply
    1,992.78x = 2,991.60 × 1,171.44
  4. Step 4: Simplify right side
    1,992.78x = 3,504,479.90
  5. Step 5: Solve for x
    x = 3,504,479.90/1,992.78
  6. Step 6: Final answer
    x = 1,758.59

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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.