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Finding the Fourth Proportional to 329.78, 454.98 and 198.76

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Solution

The fourth proportional to 329.78, 454.98 and 198.76 is: 274.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.78 : 454.98 = 198.76 : x
  2. Step 2: Convert to fraction form
    329.78/454.98 = 198.76/x
  3. Step 3: Cross multiply
    329.78x = 454.98 × 198.76
  4. Step 4: Simplify right side
    329.78x = 90,431.82
  5. Step 5: Solve for x
    x = 90,431.82/329.78
  6. Step 6: Final answer
    x = 274.22

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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.