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Finding the Fourth Proportional to 1,990, 2,745.75 and 1,203.89

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Solution

The fourth proportional to 1,990, 2,745.75 and 1,203.89 is: 1,661.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990 : 2,745.75 = 1,203.89 : x
  2. Step 2: Convert to fraction form
    1,990/2,745.75 = 1,203.89/x
  3. Step 3: Cross multiply
    1,990x = 2,745.75 × 1,203.89
  4. Step 4: Simplify right side
    1,990x = 3,305,580.97
  5. Step 5: Solve for x
    x = 3,305,580.97/1,990
  6. Step 6: Final answer
    x = 1,661.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.