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Finding the Fourth Proportional to 198.87, 274.37 and 139.89

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Solution

The fourth proportional to 198.87, 274.37 and 139.89 is: 193.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.87 : 274.37 = 139.89 : x
  2. Step 2: Convert to fraction form
    198.87/274.37 = 139.89/x
  3. Step 3: Cross multiply
    198.87x = 274.37 × 139.89
  4. Step 4: Simplify right side
    198.87x = 38,380.92
  5. Step 5: Solve for x
    x = 38,380.92/198.87
  6. Step 6: Final answer
    x = 193.00

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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.