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Finding the Fourth Proportional to 205.60, 283.68 and 122.72

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Solution

The fourth proportional to 205.60, 283.68 and 122.72 is: 169.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.60 : 283.68 = 122.72 : x
  2. Step 2: Convert to fraction form
    205.60/283.68 = 122.72/x
  3. Step 3: Cross multiply
    205.60x = 283.68 × 122.72
  4. Step 4: Simplify right side
    205.60x = 34,813.21
  5. Step 5: Solve for x
    x = 34,813.21/205.60
  6. Step 6: Final answer
    x = 169.32

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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.