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Finding the Fourth Proportional to 272.65, 409.11 and 128.38

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Solution

The fourth proportional to 272.65, 409.11 and 128.38 is: 192.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.65 : 409.11 = 128.38 : x
  2. Step 2: Convert to fraction form
    272.65/409.11 = 128.38/x
  3. Step 3: Cross multiply
    272.65x = 409.11 × 128.38
  4. Step 4: Simplify right side
    272.65x = 52,521.54
  5. Step 5: Solve for x
    x = 52,521.54/272.65
  6. Step 6: Final answer
    x = 192.63

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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.