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Finding the Fourth Proportional to 286.61, 395.11 and 231.35

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Solution

The fourth proportional to 286.61, 395.11 and 231.35 is: 318.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.61 : 395.11 = 231.35 : x
  2. Step 2: Convert to fraction form
    286.61/395.11 = 231.35/x
  3. Step 3: Cross multiply
    286.61x = 395.11 × 231.35
  4. Step 4: Simplify right side
    286.61x = 91,408.70
  5. Step 5: Solve for x
    x = 91,408.70/286.61
  6. Step 6: Final answer
    x = 318.93

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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.