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Finding the Fourth Proportional to 142.72, 196.97 and 121.93

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Solution

The fourth proportional to 142.72, 196.97 and 121.93 is: 168.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.72 : 196.97 = 121.93 : x
  2. Step 2: Convert to fraction form
    142.72/196.97 = 121.93/x
  3. Step 3: Cross multiply
    142.72x = 196.97 × 121.93
  4. Step 4: Simplify right side
    142.72x = 24,015.45
  5. Step 5: Solve for x
    x = 24,015.45/142.72
  6. Step 6: Final answer
    x = 168.27

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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.