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Finding the Fourth Proportional to 133.36, 184.20 and 121.68

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Solution

The fourth proportional to 133.36, 184.20 and 121.68 is: 168.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.36 : 184.20 = 121.68 : x
  2. Step 2: Convert to fraction form
    133.36/184.20 = 121.68/x
  3. Step 3: Cross multiply
    133.36x = 184.20 × 121.68
  4. Step 4: Simplify right side
    133.36x = 22,413.46
  5. Step 5: Solve for x
    x = 22,413.46/133.36
  6. Step 6: Final answer
    x = 168.07

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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.