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Finding the Fourth Proportional to 229.12, 343.78 and 212.24

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Solution

The fourth proportional to 229.12, 343.78 and 212.24 is: 318.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.12 : 343.78 = 212.24 : x
  2. Step 2: Convert to fraction form
    229.12/343.78 = 212.24/x
  3. Step 3: Cross multiply
    229.12x = 343.78 × 212.24
  4. Step 4: Simplify right side
    229.12x = 72,964.20
  5. Step 5: Solve for x
    x = 72,964.20/229.12
  6. Step 6: Final answer
    x = 318.46

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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.