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Finding the Fourth Proportional to 274.92, 412.49 and 128.76

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Solution

The fourth proportional to 274.92, 412.49 and 128.76 is: 193.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.92 : 412.49 = 128.76 : x
  2. Step 2: Convert to fraction form
    274.92/412.49 = 128.76/x
  3. Step 3: Cross multiply
    274.92x = 412.49 × 128.76
  4. Step 4: Simplify right side
    274.92x = 53,112.21
  5. Step 5: Solve for x
    x = 53,112.21/274.92
  6. Step 6: Final answer
    x = 193.19

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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.