Home / 1,987.09-2,742.43-1,147.79

Finding the Fourth Proportional to 1,987.09, 2,742.43 and 1,147.79

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Solution

The fourth proportional to 1,987.09, 2,742.43 and 1,147.79 is: 1,584.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.09 : 2,742.43 = 1,147.79 : x
  2. Step 2: Convert to fraction form
    1,987.09/2,742.43 = 1,147.79/x
  3. Step 3: Cross multiply
    1,987.09x = 2,742.43 × 1,147.79
  4. Step 4: Simplify right side
    1,987.09x = 3,147,733.73
  5. Step 5: Solve for x
    x = 3,147,733.73/1,987.09
  6. Step 6: Final answer
    x = 1,584.09

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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.