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Finding the Fourth Proportional to 127.92, 175.32 and 122.88

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Solution

The fourth proportional to 127.92, 175.32 and 122.88 is: 168.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.92 : 175.32 = 122.88 : x
  2. Step 2: Convert to fraction form
    127.92/175.32 = 122.88/x
  3. Step 3: Cross multiply
    127.92x = 175.32 × 122.88
  4. Step 4: Simplify right side
    127.92x = 21,543.32
  5. Step 5: Solve for x
    x = 21,543.32/127.92
  6. Step 6: Final answer
    x = 168.41

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.