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Finding the Fourth Proportional to 685.31, 1,028.36 and 252.77

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Solution

The fourth proportional to 685.31, 1,028.36 and 252.77 is: 379.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.31 : 1,028.36 = 252.77 : x
  2. Step 2: Convert to fraction form
    685.31/1,028.36 = 252.77/x
  3. Step 3: Cross multiply
    685.31x = 1,028.36 × 252.77
  4. Step 4: Simplify right side
    685.31x = 259,932.15
  5. Step 5: Solve for x
    x = 259,932.15/685.31
  6. Step 6: Final answer
    x = 379.29

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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.