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Finding the Fourth Proportional to 274.50, 411.21 and 137.66

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Solution

The fourth proportional to 274.50, 411.21 and 137.66 is: 206.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.50 : 411.21 = 137.66 : x
  2. Step 2: Convert to fraction form
    274.50/411.21 = 137.66/x
  3. Step 3: Cross multiply
    274.50x = 411.21 × 137.66
  4. Step 4: Simplify right side
    274.50x = 56,605.11
  5. Step 5: Solve for x
    x = 56,605.11/274.50
  6. Step 6: Final answer
    x = 206.21

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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.