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Finding the Fourth Proportional to 272.42, 408.72 and 128.24

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Solution

The fourth proportional to 272.42, 408.72 and 128.24 is: 192.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.42 : 408.72 = 128.24 : x
  2. Step 2: Convert to fraction form
    272.42/408.72 = 128.24/x
  3. Step 3: Cross multiply
    272.42x = 408.72 × 128.24
  4. Step 4: Simplify right side
    272.42x = 52,414.25
  5. Step 5: Solve for x
    x = 52,414.25/272.42
  6. Step 6: Final answer
    x = 192.40

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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.