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Finding the Fourth Proportional to 143.23, 197.28 and 121.07

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Solution

The fourth proportional to 143.23, 197.28 and 121.07 is: 166.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.23 : 197.28 = 121.07 : x
  2. Step 2: Convert to fraction form
    143.23/197.28 = 121.07/x
  3. Step 3: Cross multiply
    143.23x = 197.28 × 121.07
  4. Step 4: Simplify right side
    143.23x = 23,884.69
  5. Step 5: Solve for x
    x = 23,884.69/143.23
  6. Step 6: Final answer
    x = 166.76

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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.