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Finding the Fourth Proportional to 122.16, 167.12 and 121.80

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Solution

The fourth proportional to 122.16, 167.12 and 121.80 is: 166.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.16 : 167.12 = 121.80 : x
  2. Step 2: Convert to fraction form
    122.16/167.12 = 121.80/x
  3. Step 3: Cross multiply
    122.16x = 167.12 × 121.80
  4. Step 4: Simplify right side
    122.16x = 20,355.22
  5. Step 5: Solve for x
    x = 20,355.22/122.16
  6. Step 6: Final answer
    x = 166.63

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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.