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Finding the Fourth Proportional to 198.89, 275.74 and 187.95

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Solution

The fourth proportional to 198.89, 275.74 and 187.95 is: 260.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.89 : 275.74 = 187.95 : x
  2. Step 2: Convert to fraction form
    198.89/275.74 = 187.95/x
  3. Step 3: Cross multiply
    198.89x = 275.74 × 187.95
  4. Step 4: Simplify right side
    198.89x = 51,825.33
  5. Step 5: Solve for x
    x = 51,825.33/198.89
  6. Step 6: Final answer
    x = 260.57

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.