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Finding the Fourth Proportional to 148.12, 204.42 and 121.96

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Solution

The fourth proportional to 148.12, 204.42 and 121.96 is: 168.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.12 : 204.42 = 121.96 : x
  2. Step 2: Convert to fraction form
    148.12/204.42 = 121.96/x
  3. Step 3: Cross multiply
    148.12x = 204.42 × 121.96
  4. Step 4: Simplify right side
    148.12x = 24,931.06
  5. Step 5: Solve for x
    x = 24,931.06/148.12
  6. Step 6: Final answer
    x = 168.32

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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.