Home / 2,129.20-3,189.75-1,249.54

Finding the Fourth Proportional to 2,129.20, 3,189.75 and 1,249.54

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Solution

The fourth proportional to 2,129.20, 3,189.75 and 1,249.54 is: 1,871.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.20 : 3,189.75 = 1,249.54 : x
  2. Step 2: Convert to fraction form
    2,129.20/3,189.75 = 1,249.54/x
  3. Step 3: Cross multiply
    2,129.20x = 3,189.75 × 1,249.54
  4. Step 4: Simplify right side
    2,129.20x = 3,985,720.22
  5. Step 5: Solve for x
    x = 3,985,720.22/2,129.20
  6. Step 6: Final answer
    x = 1,871.93

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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.