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Finding the Fourth Proportional to 272.82, 409.11 and 128.45

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Solution

The fourth proportional to 272.82, 409.11 and 128.45 is: 192.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.82 : 409.11 = 128.45 : x
  2. Step 2: Convert to fraction form
    272.82/409.11 = 128.45/x
  3. Step 3: Cross multiply
    272.82x = 409.11 × 128.45
  4. Step 4: Simplify right side
    272.82x = 52,548.13
  5. Step 5: Solve for x
    x = 52,548.13/272.82
  6. Step 6: Final answer
    x = 192.61

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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.