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Finding the Fourth Proportional to 274.35, 411.22 and 128.22

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Solution

The fourth proportional to 274.35, 411.22 and 128.22 is: 192.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.35 : 411.22 = 128.22 : x
  2. Step 2: Convert to fraction form
    274.35/411.22 = 128.22/x
  3. Step 3: Cross multiply
    274.35x = 411.22 × 128.22
  4. Step 4: Simplify right side
    274.35x = 52,726.63
  5. Step 5: Solve for x
    x = 52,726.63/274.35
  6. Step 6: Final answer
    x = 192.19

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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.