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Finding the Fourth Proportional to 274.05, 411.05 and 81.68

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Solution

The fourth proportional to 274.05, 411.05 and 81.68 is: 122.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.05 : 411.05 = 81.68 : x
  2. Step 2: Convert to fraction form
    274.05/411.05 = 81.68/x
  3. Step 3: Cross multiply
    274.05x = 411.05 × 81.68
  4. Step 4: Simplify right side
    274.05x = 33,572.71
  5. Step 5: Solve for x
    x = 33,572.71/274.05
  6. Step 6: Final answer
    x = 122.51

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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.