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Finding the Fourth Proportional to 274.24, 411.43 and 81.87

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Solution

The fourth proportional to 274.24, 411.43 and 81.87 is: 122.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.24 : 411.43 = 81.87 : x
  2. Step 2: Convert to fraction form
    274.24/411.43 = 81.87/x
  3. Step 3: Cross multiply
    274.24x = 411.43 × 81.87
  4. Step 4: Simplify right side
    274.24x = 33,682.99
  5. Step 5: Solve for x
    x = 33,682.99/274.24
  6. Step 6: Final answer
    x = 122.82

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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.