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Finding the Fourth Proportional to 229.25, 343.79 and 142.45

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Solution

The fourth proportional to 229.25, 343.79 and 142.45 is: 213.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.25 : 343.79 = 142.45 : x
  2. Step 2: Convert to fraction form
    229.25/343.79 = 142.45/x
  3. Step 3: Cross multiply
    229.25x = 343.79 × 142.45
  4. Step 4: Simplify right side
    229.25x = 48,972.89
  5. Step 5: Solve for x
    x = 48,972.89/229.25
  6. Step 6: Final answer
    x = 213.62

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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.