Home / 1,986.12-2,742.69-1,279.19

Finding the Fourth Proportional to 1,986.12, 2,742.69 and 1,279.19

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Solution

The fourth proportional to 1,986.12, 2,742.69 and 1,279.19 is: 1,766.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.12 : 2,742.69 = 1,279.19 : x
  2. Step 2: Convert to fraction form
    1,986.12/2,742.69 = 1,279.19/x
  3. Step 3: Cross multiply
    1,986.12x = 2,742.69 × 1,279.19
  4. Step 4: Simplify right side
    1,986.12x = 3,508,421.62
  5. Step 5: Solve for x
    x = 3,508,421.62/1,986.12
  6. Step 6: Final answer
    x = 1,766.47

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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.