Home / 1,986.21-2,738.07-1,239.84

Finding the Fourth Proportional to 1,986.21, 2,738.07 and 1,239.84

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Solution

The fourth proportional to 1,986.21, 2,738.07 and 1,239.84 is: 1,709.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.21 : 2,738.07 = 1,239.84 : x
  2. Step 2: Convert to fraction form
    1,986.21/2,738.07 = 1,239.84/x
  3. Step 3: Cross multiply
    1,986.21x = 2,738.07 × 1,239.84
  4. Step 4: Simplify right side
    1,986.21x = 3,394,768.71
  5. Step 5: Solve for x
    x = 3,394,768.71/1,986.21
  6. Step 6: Final answer
    x = 1,709.17

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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.