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Finding the Fourth Proportional to 221.78, 331.93 and 170.15

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Solution

The fourth proportional to 221.78, 331.93 and 170.15 is: 254.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.78 : 331.93 = 170.15 : x
  2. Step 2: Convert to fraction form
    221.78/331.93 = 170.15/x
  3. Step 3: Cross multiply
    221.78x = 331.93 × 170.15
  4. Step 4: Simplify right side
    221.78x = 56,476.44
  5. Step 5: Solve for x
    x = 56,476.44/221.78
  6. Step 6: Final answer
    x = 254.65

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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.