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Finding the Fourth Proportional to 205.91, 308.92 and 145.16

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Solution

The fourth proportional to 205.91, 308.92 and 145.16 is: 217.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.91 : 308.92 = 145.16 : x
  2. Step 2: Convert to fraction form
    205.91/308.92 = 145.16/x
  3. Step 3: Cross multiply
    205.91x = 308.92 × 145.16
  4. Step 4: Simplify right side
    205.91x = 44,843.78
  5. Step 5: Solve for x
    x = 44,843.78/205.91
  6. Step 6: Final answer
    x = 217.78

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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.