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Finding the Fourth Proportional to 896.82, 1,236.31 and 647.75

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Solution

The fourth proportional to 896.82, 1,236.31 and 647.75 is: 892.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.82 : 1,236.31 = 647.75 : x
  2. Step 2: Convert to fraction form
    896.82/1,236.31 = 647.75/x
  3. Step 3: Cross multiply
    896.82x = 1,236.31 × 647.75
  4. Step 4: Simplify right side
    896.82x = 800,817.96
  5. Step 5: Solve for x
    x = 800,817.96/896.82
  6. Step 6: Final answer
    x = 892.95

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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.