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Finding the Fourth Proportional to 205.15, 283.21 and 135.22

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Solution

The fourth proportional to 205.15, 283.21 and 135.22 is: 186.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.15 : 283.21 = 135.22 : x
  2. Step 2: Convert to fraction form
    205.15/283.21 = 135.22/x
  3. Step 3: Cross multiply
    205.15x = 283.21 × 135.22
  4. Step 4: Simplify right side
    205.15x = 38,293.56
  5. Step 5: Solve for x
    x = 38,293.56/205.15
  6. Step 6: Final answer
    x = 186.66

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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.