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Finding the Fourth Proportional to 122.08, 167.28 and 121.28

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Solution

The fourth proportional to 122.08, 167.28 and 121.28 is: 166.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.08 : 167.28 = 121.28 : x
  2. Step 2: Convert to fraction form
    122.08/167.28 = 121.28/x
  3. Step 3: Cross multiply
    122.08x = 167.28 × 121.28
  4. Step 4: Simplify right side
    122.08x = 20,287.72
  5. Step 5: Solve for x
    x = 20,287.72/122.08
  6. Step 6: Final answer
    x = 166.18

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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.