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Finding the Fourth Proportional to 205.90, 284.15 and 118.57

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Solution

The fourth proportional to 205.90, 284.15 and 118.57 is: 163.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.90 : 284.15 = 118.57 : x
  2. Step 2: Convert to fraction form
    205.90/284.15 = 118.57/x
  3. Step 3: Cross multiply
    205.90x = 284.15 × 118.57
  4. Step 4: Simplify right side
    205.90x = 33,692.32
  5. Step 5: Solve for x
    x = 33,692.32/205.90
  6. Step 6: Final answer
    x = 163.64

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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.