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Finding the Fourth Proportional to 286.11, 428.82 and 123.92

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Solution

The fourth proportional to 286.11, 428.82 and 123.92 is: 185.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.11 : 428.82 = 123.92 : x
  2. Step 2: Convert to fraction form
    286.11/428.82 = 123.92/x
  3. Step 3: Cross multiply
    286.11x = 428.82 × 123.92
  4. Step 4: Simplify right side
    286.11x = 53,137.23
  5. Step 5: Solve for x
    x = 53,137.23/286.11
  6. Step 6: Final answer
    x = 185.72

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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.