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Finding the Fourth Proportional to 229.42, 343.86 and 121.15

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Solution

The fourth proportional to 229.42, 343.86 and 121.15 is: 181.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.42 : 343.86 = 121.15 : x
  2. Step 2: Convert to fraction form
    229.42/343.86 = 121.15/x
  3. Step 3: Cross multiply
    229.42x = 343.86 × 121.15
  4. Step 4: Simplify right side
    229.42x = 41,658.64
  5. Step 5: Solve for x
    x = 41,658.64/229.42
  6. Step 6: Final answer
    x = 181.58

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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.