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Finding the Fourth Proportional to 205.28, 283.26 and 122.40

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Solution

The fourth proportional to 205.28, 283.26 and 122.40 is: 168.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.28 : 283.26 = 122.40 : x
  2. Step 2: Convert to fraction form
    205.28/283.26 = 122.40/x
  3. Step 3: Cross multiply
    205.28x = 283.26 × 122.40
  4. Step 4: Simplify right side
    205.28x = 34,671.02
  5. Step 5: Solve for x
    x = 34,671.02/205.28
  6. Step 6: Final answer
    x = 168.90

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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.