Home / 1,991.90-2,747.30-1,205.12

Finding the Fourth Proportional to 1,991.90, 2,747.30 and 1,205.12

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Solution

The fourth proportional to 1,991.90, 2,747.30 and 1,205.12 is: 1,662.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.90 : 2,747.30 = 1,205.12 : x
  2. Step 2: Convert to fraction form
    1,991.90/2,747.30 = 1,205.12/x
  3. Step 3: Cross multiply
    1,991.90x = 2,747.30 × 1,205.12
  4. Step 4: Simplify right side
    1,991.90x = 3,310,826.18
  5. Step 5: Solve for x
    x = 3,310,826.18/1,991.90
  6. Step 6: Final answer
    x = 1,662.14

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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.