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Finding the Fourth Proportional to 274.11, 411.20 and 137.18

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Solution

The fourth proportional to 274.11, 411.20 and 137.18 is: 205.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.11 : 411.20 = 137.18 : x
  2. Step 2: Convert to fraction form
    274.11/411.20 = 137.18/x
  3. Step 3: Cross multiply
    274.11x = 411.20 × 137.18
  4. Step 4: Simplify right side
    274.11x = 56,405.67
  5. Step 5: Solve for x
    x = 56,405.67/274.11
  6. Step 6: Final answer
    x = 205.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.