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Finding the Fourth Proportional to 1,380.73, 2,069.71 and 686.33

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Solution

The fourth proportional to 1,380.73, 2,069.71 and 686.33 is: 1,028.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.73 : 2,069.71 = 686.33 : x
  2. Step 2: Convert to fraction form
    1,380.73/2,069.71 = 686.33/x
  3. Step 3: Cross multiply
    1,380.73x = 2,069.71 × 686.33
  4. Step 4: Simplify right side
    1,380.73x = 1,420,504.06
  5. Step 5: Solve for x
    x = 1,420,504.06/1,380.73
  6. Step 6: Final answer
    x = 1,028.81

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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.