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Finding the Fourth Proportional to 205.66, 283.85 and 161.31

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Solution

The fourth proportional to 205.66, 283.85 and 161.31 is: 222.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.66 : 283.85 = 161.31 : x
  2. Step 2: Convert to fraction form
    205.66/283.85 = 161.31/x
  3. Step 3: Cross multiply
    205.66x = 283.85 × 161.31
  4. Step 4: Simplify right side
    205.66x = 45,787.84
  5. Step 5: Solve for x
    x = 45,787.84/205.66
  6. Step 6: Final answer
    x = 222.64

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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.