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Finding the Fourth Proportional to 1,903.40, 2,855.13 and 863.21

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Solution

The fourth proportional to 1,903.40, 2,855.13 and 863.21 is: 1,294.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,903.40 : 2,855.13 = 863.21 : x
  2. Step 2: Convert to fraction form
    1,903.40/2,855.13 = 863.21/x
  3. Step 3: Cross multiply
    1,903.40x = 2,855.13 × 863.21
  4. Step 4: Simplify right side
    1,903.40x = 2,464,576.77
  5. Step 5: Solve for x
    x = 2,464,576.77/1,903.40
  6. Step 6: Final answer
    x = 1,294.83

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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.