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Finding the Fourth Proportional to 205.02, 307.41 and 81.63

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Solution

The fourth proportional to 205.02, 307.41 and 81.63 is: 122.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.02 : 307.41 = 81.63 : x
  2. Step 2: Convert to fraction form
    205.02/307.41 = 81.63/x
  3. Step 3: Cross multiply
    205.02x = 307.41 × 81.63
  4. Step 4: Simplify right side
    205.02x = 25,093.88
  5. Step 5: Solve for x
    x = 25,093.88/205.02
  6. Step 6: Final answer
    x = 122.40

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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.