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Finding the Fourth Proportional to 286.05, 428.39 and 271.70

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Solution

The fourth proportional to 286.05, 428.39 and 271.70 is: 406.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.05 : 428.39 = 271.70 : x
  2. Step 2: Convert to fraction form
    286.05/428.39 = 271.70/x
  3. Step 3: Cross multiply
    286.05x = 428.39 × 271.70
  4. Step 4: Simplify right side
    286.05x = 116,393.71
  5. Step 5: Solve for x
    x = 116,393.71/286.05
  6. Step 6: Final answer
    x = 406.89

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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.