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Finding the Fourth Proportional to 127.12, 175.33 and 122.88

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Solution

The fourth proportional to 127.12, 175.33 and 122.88 is: 169.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.12 : 175.33 = 122.88 : x
  2. Step 2: Convert to fraction form
    127.12/175.33 = 122.88/x
  3. Step 3: Cross multiply
    127.12x = 175.33 × 122.88
  4. Step 4: Simplify right side
    127.12x = 21,544.24
  5. Step 5: Solve for x
    x = 21,544.24/127.12
  6. Step 6: Final answer
    x = 169.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.