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Finding the Fourth Proportional to 1,781.11, 2,671.89 and 685.33

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Solution

The fourth proportional to 1,781.11, 2,671.89 and 685.33 is: 1,028.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.11 : 2,671.89 = 685.33 : x
  2. Step 2: Convert to fraction form
    1,781.11/2,671.89 = 685.33/x
  3. Step 3: Cross multiply
    1,781.11x = 2,671.89 × 685.33
  4. Step 4: Simplify right side
    1,781.11x = 1,831,133.05
  5. Step 5: Solve for x
    x = 1,831,133.05/1,781.11
  6. Step 6: Final answer
    x = 1,028.09

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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.