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Finding the Fourth Proportional to 240.40, 331.60 and 161.56

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Solution

The fourth proportional to 240.40, 331.60 and 161.56 is: 222.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    240.40 : 331.60 = 161.56 : x
  2. Step 2: Convert to fraction form
    240.40/331.60 = 161.56/x
  3. Step 3: Cross multiply
    240.40x = 331.60 × 161.56
  4. Step 4: Simplify right side
    240.40x = 53,573.30
  5. Step 5: Solve for x
    x = 53,573.30/240.40
  6. Step 6: Final answer
    x = 222.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.