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Finding the Fourth Proportional to 1,989.81, 2,745.21 and 1,203.57

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Solution

The fourth proportional to 1,989.81, 2,745.21 and 1,203.57 is: 1,660.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.81 : 2,745.21 = 1,203.57 : x
  2. Step 2: Convert to fraction form
    1,989.81/2,745.21 = 1,203.57/x
  3. Step 3: Cross multiply
    1,989.81x = 2,745.21 × 1,203.57
  4. Step 4: Simplify right side
    1,989.81x = 3,304,052.40
  5. Step 5: Solve for x
    x = 3,304,052.40/1,989.81
  6. Step 6: Final answer
    x = 1,660.49

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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.