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Finding the Fourth Proportional to 274.10, 411.20 and 111.80

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Solution

The fourth proportional to 274.10, 411.20 and 111.80 is: 167.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.10 : 411.20 = 111.80 : x
  2. Step 2: Convert to fraction form
    274.10/411.20 = 111.80/x
  3. Step 3: Cross multiply
    274.10x = 411.20 × 111.80
  4. Step 4: Simplify right side
    274.10x = 45,969.55
  5. Step 5: Solve for x
    x = 45,969.55/274.10
  6. Step 6: Final answer
    x = 167.71

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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.