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Finding the Fourth Proportional to 229.23, 343.78 and 90.39

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Solution

The fourth proportional to 229.23, 343.78 and 90.39 is: 135.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.23 : 343.78 = 90.39 : x
  2. Step 2: Convert to fraction form
    229.23/343.78 = 90.39/x
  3. Step 3: Cross multiply
    229.23x = 343.78 × 90.39
  4. Step 4: Simplify right side
    229.23x = 31,072.78
  5. Step 5: Solve for x
    x = 31,072.78/229.23
  6. Step 6: Final answer
    x = 135.55

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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.