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Finding the Fourth Proportional to 1,991.78, 2,747.90 and 1,235.21

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Solution

The fourth proportional to 1,991.78, 2,747.90 and 1,235.21 is: 1,704.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.78 : 2,747.90 = 1,235.21 : x
  2. Step 2: Convert to fraction form
    1,991.78/2,747.90 = 1,235.21/x
  3. Step 3: Cross multiply
    1,991.78x = 2,747.90 × 1,235.21
  4. Step 4: Simplify right side
    1,991.78x = 3,394,222.91
  5. Step 5: Solve for x
    x = 3,394,222.91/1,991.78
  6. Step 6: Final answer
    x = 1,704.12

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1.5x scale

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.