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Finding the Fourth Proportional to 1,958.18, 2,938.63 and 863.31

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Solution

The fourth proportional to 1,958.18, 2,938.63 and 863.31 is: 1,295.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,958.18 : 2,938.63 = 863.31 : x
  2. Step 2: Convert to fraction form
    1,958.18/2,938.63 = 863.31/x
  3. Step 3: Cross multiply
    1,958.18x = 2,938.63 × 863.31
  4. Step 4: Simplify right side
    1,958.18x = 2,536,942.62
  5. Step 5: Solve for x
    x = 2,536,942.62/1,958.18
  6. Step 6: Final answer
    x = 1,295.56

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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.