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Finding the Fourth Proportional to 154.29, 213.21 and 121.80

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Solution

The fourth proportional to 154.29, 213.21 and 121.80 is: 168.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.29 : 213.21 = 121.80 : x
  2. Step 2: Convert to fraction form
    154.29/213.21 = 121.80/x
  3. Step 3: Cross multiply
    154.29x = 213.21 × 121.80
  4. Step 4: Simplify right side
    154.29x = 25,968.98
  5. Step 5: Solve for x
    x = 25,968.98/154.29
  6. Step 6: Final answer
    x = 168.31

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.