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Finding the Fourth Proportional to 685.27, 1,028.01 and 252.39

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Solution

The fourth proportional to 685.27, 1,028.01 and 252.39 is: 378.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.27 : 1,028.01 = 252.39 : x
  2. Step 2: Convert to fraction form
    685.27/1,028.01 = 252.39/x
  3. Step 3: Cross multiply
    685.27x = 1,028.01 × 252.39
  4. Step 4: Simplify right side
    685.27x = 259,458.18
  5. Step 5: Solve for x
    x = 259,458.18/685.27
  6. Step 6: Final answer
    x = 378.62

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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.