Home / 2,161.12-2,982.12-1,276.78

Finding the Fourth Proportional to 2,161.12, 2,982.12 and 1,276.78

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Solution

The fourth proportional to 2,161.12, 2,982.12 and 1,276.78 is: 1,761.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,161.12 : 2,982.12 = 1,276.78 : x
  2. Step 2: Convert to fraction form
    2,161.12/2,982.12 = 1,276.78/x
  3. Step 3: Cross multiply
    2,161.12x = 2,982.12 × 1,276.78
  4. Step 4: Simplify right side
    2,161.12x = 3,807,511.17
  5. Step 5: Solve for x
    x = 3,807,511.17/2,161.12
  6. Step 6: Final answer
    x = 1,761.82

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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.