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Finding the Fourth Proportional to 198.64, 274.20 and 121

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Solution

The fourth proportional to 198.64, 274.20 and 121 is: 167.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.64 : 274.20 = 121 : x
  2. Step 2: Convert to fraction form
    198.64/274.20 = 121/x
  3. Step 3: Cross multiply
    198.64x = 274.20 × 121
  4. Step 4: Simplify right side
    198.64x = 33,178.20
  5. Step 5: Solve for x
    x = 33,178.20/198.64
  6. Step 6: Final answer
    x = 167.03

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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.