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Finding the Fourth Proportional to 205.20, 283.20 and 117.87

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Solution

The fourth proportional to 205.20, 283.20 and 117.87 is: 162.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.20 : 283.20 = 117.87 : x
  2. Step 2: Convert to fraction form
    205.20/283.20 = 117.87/x
  3. Step 3: Cross multiply
    205.20x = 283.20 × 117.87
  4. Step 4: Simplify right side
    205.20x = 33,380.78
  5. Step 5: Solve for x
    x = 33,380.78/205.20
  6. Step 6: Final answer
    x = 162.67

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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.