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Finding the Fourth Proportional to 2,187.82, 3,279.90 and 1,090.68

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Solution

The fourth proportional to 2,187.82, 3,279.90 and 1,090.68 is: 1,635.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,187.82 : 3,279.90 = 1,090.68 : x
  2. Step 2: Convert to fraction form
    2,187.82/3,279.90 = 1,090.68/x
  3. Step 3: Cross multiply
    2,187.82x = 3,279.90 × 1,090.68
  4. Step 4: Simplify right side
    2,187.82x = 3,577,321.33
  5. Step 5: Solve for x
    x = 3,577,321.33/2,187.82
  6. Step 6: Final answer
    x = 1,635.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.