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Finding the Fourth Proportional to 148.20, 222.80 and 121.34

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Solution

The fourth proportional to 148.20, 222.80 and 121.34 is: 182.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.20 : 222.80 = 121.34 : x
  2. Step 2: Convert to fraction form
    148.20/222.80 = 121.34/x
  3. Step 3: Cross multiply
    148.20x = 222.80 × 121.34
  4. Step 4: Simplify right side
    148.20x = 27,034.55
  5. Step 5: Solve for x
    x = 27,034.55/148.20
  6. Step 6: Final answer
    x = 182.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.