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Finding the Fourth Proportional to 205.98, 284.28 and 118.65

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Solution

The fourth proportional to 205.98, 284.28 and 118.65 is: 163.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.98 : 284.28 = 118.65 : x
  2. Step 2: Convert to fraction form
    205.98/284.28 = 118.65/x
  3. Step 3: Cross multiply
    205.98x = 284.28 × 118.65
  4. Step 4: Simplify right side
    205.98x = 33,729.82
  5. Step 5: Solve for x
    x = 33,729.82/205.98
  6. Step 6: Final answer
    x = 163.75

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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.