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Finding the Fourth Proportional to 229.78, 316.86 and 198.67

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Solution

The fourth proportional to 229.78, 316.86 and 198.67 is: 273.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.78 : 316.86 = 198.67 : x
  2. Step 2: Convert to fraction form
    229.78/316.86 = 198.67/x
  3. Step 3: Cross multiply
    229.78x = 316.86 × 198.67
  4. Step 4: Simplify right side
    229.78x = 62,950.58
  5. Step 5: Solve for x
    x = 62,950.58/229.78
  6. Step 6: Final answer
    x = 273.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.