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Finding the Fourth Proportional to 205.37, 307.94 and 81.86

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Solution

The fourth proportional to 205.37, 307.94 and 81.86 is: 122.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.37 : 307.94 = 81.86 : x
  2. Step 2: Convert to fraction form
    205.37/307.94 = 81.86/x
  3. Step 3: Cross multiply
    205.37x = 307.94 × 81.86
  4. Step 4: Simplify right side
    205.37x = 25,206.02
  5. Step 5: Solve for x
    x = 25,206.02/205.37
  6. Step 6: Final answer
    x = 122.74

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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.