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Finding the Fourth Proportional to 286.08, 428.85 and 112.65

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Solution

The fourth proportional to 286.08, 428.85 and 112.65 is: 168.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.08 : 428.85 = 112.65 : x
  2. Step 2: Convert to fraction form
    286.08/428.85 = 112.65/x
  3. Step 3: Cross multiply
    286.08x = 428.85 × 112.65
  4. Step 4: Simplify right side
    286.08x = 48,309.95
  5. Step 5: Solve for x
    x = 48,309.95/286.08
  6. Step 6: Final answer
    x = 168.87

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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.