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Finding the Fourth Proportional to 198.68, 274.17 and 111.35

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Solution

The fourth proportional to 198.68, 274.17 and 111.35 is: 153.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.68 : 274.17 = 111.35 : x
  2. Step 2: Convert to fraction form
    198.68/274.17 = 111.35/x
  3. Step 3: Cross multiply
    198.68x = 274.17 × 111.35
  4. Step 4: Simplify right side
    198.68x = 30,529.51
  5. Step 5: Solve for x
    x = 30,529.51/198.68
  6. Step 6: Final answer
    x = 153.66

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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.