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Finding the Fourth Proportional to 198.63, 274.20 and 189.93

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Solution

The fourth proportional to 198.63, 274.20 and 189.93 is: 262.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.63 : 274.20 = 189.93 : x
  2. Step 2: Convert to fraction form
    198.63/274.20 = 189.93/x
  3. Step 3: Cross multiply
    198.63x = 274.20 × 189.93
  4. Step 4: Simplify right side
    198.63x = 52,078.81
  5. Step 5: Solve for x
    x = 52,078.81/198.63
  6. Step 6: Final answer
    x = 262.19

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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.