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Finding the Fourth Proportional to 685.64, 1,028.14 and 198.56

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Solution

The fourth proportional to 685.64, 1,028.14 and 198.56 is: 297.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.64 : 1,028.14 = 198.56 : x
  2. Step 2: Convert to fraction form
    685.64/1,028.14 = 198.56/x
  3. Step 3: Cross multiply
    685.64x = 1,028.14 × 198.56
  4. Step 4: Simplify right side
    685.64x = 204,149.55
  5. Step 5: Solve for x
    x = 204,149.55/685.64
  6. Step 6: Final answer
    x = 297.75

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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.