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Finding the Fourth Proportional to 229.58, 343.98 and 221.15

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Solution

The fourth proportional to 229.58, 343.98 and 221.15 is: 331.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.58 : 343.98 = 221.15 : x
  2. Step 2: Convert to fraction form
    229.58/343.98 = 221.15/x
  3. Step 3: Cross multiply
    229.58x = 343.98 × 221.15
  4. Step 4: Simplify right side
    229.58x = 76,071.18
  5. Step 5: Solve for x
    x = 76,071.18/229.58
  6. Step 6: Final answer
    x = 331.35

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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.