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Finding the Fourth Proportional to 1,338.93, 1,993.21 and 1,331.64

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Solution

The fourth proportional to 1,338.93, 1,993.21 and 1,331.64 is: 1,982.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.93 : 1,993.21 = 1,331.64 : x
  2. Step 2: Convert to fraction form
    1,338.93/1,993.21 = 1,331.64/x
  3. Step 3: Cross multiply
    1,338.93x = 1,993.21 × 1,331.64
  4. Step 4: Simplify right side
    1,338.93x = 2,654,234.84
  5. Step 5: Solve for x
    x = 2,654,234.84/1,338.93
  6. Step 6: Final answer
    x = 1,982.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.