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Finding the Fourth Proportional to 2,082, 3,123 and 1,261.20

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Solution

The fourth proportional to 2,082, 3,123 and 1,261.20 is: 1,891.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,082 : 3,123 = 1,261.20 : x
  2. Step 2: Convert to fraction form
    2,082/3,123 = 1,261.20/x
  3. Step 3: Cross multiply
    2,082x = 3,123 × 1,261.20
  4. Step 4: Simplify right side
    2,082x = 3,938,727.60
  5. Step 5: Solve for x
    x = 3,938,727.60/2,082
  6. Step 6: Final answer
    x = 1,891.80

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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.