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Finding the Fourth Proportional to 1,331.74, 1,993.49 and 1,040.09

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Solution

The fourth proportional to 1,331.74, 1,993.49 and 1,040.09 is: 1,556.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.74 : 1,993.49 = 1,040.09 : x
  2. Step 2: Convert to fraction form
    1,331.74/1,993.49 = 1,040.09/x
  3. Step 3: Cross multiply
    1,331.74x = 1,993.49 × 1,040.09
  4. Step 4: Simplify right side
    1,331.74x = 2,073,406.03
  5. Step 5: Solve for x
    x = 2,073,406.03/1,331.74
  6. Step 6: Final answer
    x = 1,556.91

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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.