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Finding the Fourth Proportional to 286.46, 395.50 and 221.12

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Solution

The fourth proportional to 286.46, 395.50 and 221.12 is: 305.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.46 : 395.50 = 221.12 : x
  2. Step 2: Convert to fraction form
    286.46/395.50 = 221.12/x
  3. Step 3: Cross multiply
    286.46x = 395.50 × 221.12
  4. Step 4: Simplify right side
    286.46x = 87,452.96
  5. Step 5: Solve for x
    x = 87,452.96/286.46
  6. Step 6: Final answer
    x = 305.29

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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.