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Finding the Fourth Proportional to 205.40, 282.60 and 161.64

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Solution

The fourth proportional to 205.40, 282.60 and 161.64 is: 222.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.40 : 282.60 = 161.64 : x
  2. Step 2: Convert to fraction form
    205.40/282.60 = 161.64/x
  3. Step 3: Cross multiply
    205.40x = 282.60 × 161.64
  4. Step 4: Simplify right side
    205.40x = 45,679.46
  5. Step 5: Solve for x
    x = 45,679.46/205.40
  6. Step 6: Final answer
    x = 222.39

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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.