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Finding the Fourth Proportional to 863.21, 1,295 and 286.09

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Solution

The fourth proportional to 863.21, 1,295 and 286.09 is: 429.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.21 : 1,295 = 286.09 : x
  2. Step 2: Convert to fraction form
    863.21/1,295 = 286.09/x
  3. Step 3: Cross multiply
    863.21x = 1,295 × 286.09
  4. Step 4: Simplify right side
    863.21x = 370,486.55
  5. Step 5: Solve for x
    x = 370,486.55/863.21
  6. Step 6: Final answer
    x = 429.20

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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.