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Finding the Fourth Proportional to 685.67, 1,028.16 and 198.59

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Solution

The fourth proportional to 685.67, 1,028.16 and 198.59 is: 297.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.67 : 1,028.16 = 198.59 : x
  2. Step 2: Convert to fraction form
    685.67/1,028.16 = 198.59/x
  3. Step 3: Cross multiply
    685.67x = 1,028.16 × 198.59
  4. Step 4: Simplify right side
    685.67x = 204,177.15
  5. Step 5: Solve for x
    x = 204,177.15/685.67
  6. Step 6: Final answer
    x = 297.78

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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.