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Finding the Fourth Proportional to 274.33, 411.23 and 128.02

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Solution

The fourth proportional to 274.33, 411.23 and 128.02 is: 191.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.33 : 411.23 = 128.02 : x
  2. Step 2: Convert to fraction form
    274.33/411.23 = 128.02/x
  3. Step 3: Cross multiply
    274.33x = 411.23 × 128.02
  4. Step 4: Simplify right side
    274.33x = 52,642.97
  5. Step 5: Solve for x
    x = 52,642.97/274.33
  6. Step 6: Final answer
    x = 191.90

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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.