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Finding the Fourth Proportional to 205.20, 283.16 and 111.95

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Solution

The fourth proportional to 205.20, 283.16 and 111.95 is: 154.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.20 : 283.16 = 111.95 : x
  2. Step 2: Convert to fraction form
    205.20/283.16 = 111.95/x
  3. Step 3: Cross multiply
    205.20x = 283.16 × 111.95
  4. Step 4: Simplify right side
    205.20x = 31,697.79
  5. Step 5: Solve for x
    x = 31,697.79/205.20
  6. Step 6: Final answer
    x = 154.47

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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.