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Finding the Fourth Proportional to 685.73, 1,028.69 and 252.83

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Solution

The fourth proportional to 685.73, 1,028.69 and 252.83 is: 379.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.73 : 1,028.69 = 252.83 : x
  2. Step 2: Convert to fraction form
    685.73/1,028.69 = 252.83/x
  3. Step 3: Cross multiply
    685.73x = 1,028.69 × 252.83
  4. Step 4: Simplify right side
    685.73x = 260,083.69
  5. Step 5: Solve for x
    x = 260,083.69/685.73
  6. Step 6: Final answer
    x = 379.28

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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.