Home / 1,986.28-2,739.36-1,239.46

Finding the Fourth Proportional to 1,986.28, 2,739.36 and 1,239.46

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Solution

The fourth proportional to 1,986.28, 2,739.36 and 1,239.46 is: 1,709.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.28 : 2,739.36 = 1,239.46 : x
  2. Step 2: Convert to fraction form
    1,986.28/2,739.36 = 1,239.46/x
  3. Step 3: Cross multiply
    1,986.28x = 2,739.36 × 1,239.46
  4. Step 4: Simplify right side
    1,986.28x = 3,395,327.15
  5. Step 5: Solve for x
    x = 3,395,327.15/1,986.28
  6. Step 6: Final answer
    x = 1,709.39

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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.