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Finding the Fourth Proportional to 1,990.90, 2,983.92 and 1,123.42

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Solution

The fourth proportional to 1,990.90, 2,983.92 and 1,123.42 is: 1,683.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.90 : 2,983.92 = 1,123.42 : x
  2. Step 2: Convert to fraction form
    1,990.90/2,983.92 = 1,123.42/x
  3. Step 3: Cross multiply
    1,990.90x = 2,983.92 × 1,123.42
  4. Step 4: Simplify right side
    1,990.90x = 3,352,195.41
  5. Step 5: Solve for x
    x = 3,352,195.41/1,990.90
  6. Step 6: Final answer
    x = 1,683.76

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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.