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Finding the Fourth Proportional to 274.75, 411.61 and 137.64

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Solution

The fourth proportional to 274.75, 411.61 and 137.64 is: 206.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.75 : 411.61 = 137.64 : x
  2. Step 2: Convert to fraction form
    274.75/411.61 = 137.64/x
  3. Step 3: Cross multiply
    274.75x = 411.61 × 137.64
  4. Step 4: Simplify right side
    274.75x = 56,651.94
  5. Step 5: Solve for x
    x = 56,651.94/274.75
  6. Step 6: Final answer
    x = 206.19

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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.