Home / 2,138.85-3,206.09-1,212.45

Finding the Fourth Proportional to 2,138.85, 3,206.09 and 1,212.45

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Solution

The fourth proportional to 2,138.85, 3,206.09 and 1,212.45 is: 1,817.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.85 : 3,206.09 = 1,212.45 : x
  2. Step 2: Convert to fraction form
    2,138.85/3,206.09 = 1,212.45/x
  3. Step 3: Cross multiply
    2,138.85x = 3,206.09 × 1,212.45
  4. Step 4: Simplify right side
    2,138.85x = 3,887,217.76
  5. Step 5: Solve for x
    x = 3,887,217.76/2,138.85
  6. Step 6: Final answer
    x = 1,817.44

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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.