Home / 1,987.22-2,742.42-1,091

Finding the Fourth Proportional to 1,987.22, 2,742.42 and 1,091

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Solution

The fourth proportional to 1,987.22, 2,742.42 and 1,091 is: 1,505.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.22 : 2,742.42 = 1,091 : x
  2. Step 2: Convert to fraction form
    1,987.22/2,742.42 = 1,091/x
  3. Step 3: Cross multiply
    1,987.22x = 2,742.42 × 1,091
  4. Step 4: Simplify right side
    1,987.22x = 2,991,980.22
  5. Step 5: Solve for x
    x = 2,991,980.22/1,987.22
  6. Step 6: Final answer
    x = 1,505.61

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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.