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Finding the Fourth Proportional to 1,890.78, 2,834.21 and 1,369.49

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Solution

The fourth proportional to 1,890.78, 2,834.21 and 1,369.49 is: 2,052.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,890.78 : 2,834.21 = 1,369.49 : x
  2. Step 2: Convert to fraction form
    1,890.78/2,834.21 = 1,369.49/x
  3. Step 3: Cross multiply
    1,890.78x = 2,834.21 × 1,369.49
  4. Step 4: Simplify right side
    1,890.78x = 3,881,401.23
  5. Step 5: Solve for x
    x = 3,881,401.23/1,890.78
  6. Step 6: Final answer
    x = 2,052.80

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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.