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Finding the Fourth Proportional to 2,938.69, 4,396.90 and 1,813.22

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Solution

The fourth proportional to 2,938.69, 4,396.90 and 1,813.22 is: 2,712.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,938.69 : 4,396.90 = 1,813.22 : x
  2. Step 2: Convert to fraction form
    2,938.69/4,396.90 = 1,813.22/x
  3. Step 3: Cross multiply
    2,938.69x = 4,396.90 × 1,813.22
  4. Step 4: Simplify right side
    2,938.69x = 7,972,527.30
  5. Step 5: Solve for x
    x = 7,972,527.30/2,938.69
  6. Step 6: Final answer
    x = 2,712.96

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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.