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Finding the Fourth Proportional to 286.14, 428.79 and 205.02

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Solution

The fourth proportional to 286.14, 428.79 and 205.02 is: 307.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.14 : 428.79 = 205.02 : x
  2. Step 2: Convert to fraction form
    286.14/428.79 = 205.02/x
  3. Step 3: Cross multiply
    286.14x = 428.79 × 205.02
  4. Step 4: Simplify right side
    286.14x = 87,910.53
  5. Step 5: Solve for x
    x = 87,910.53/286.14
  6. Step 6: Final answer
    x = 307.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.