Home / 2,129.29-3,189.07-1,261.78

Finding the Fourth Proportional to 2,129.29, 3,189.07 and 1,261.78

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Solution

The fourth proportional to 2,129.29, 3,189.07 and 1,261.78 is: 1,889.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.29 : 3,189.07 = 1,261.78 : x
  2. Step 2: Convert to fraction form
    2,129.29/3,189.07 = 1,261.78/x
  3. Step 3: Cross multiply
    2,129.29x = 3,189.07 × 1,261.78
  4. Step 4: Simplify right side
    2,129.29x = 4,023,893.62
  5. Step 5: Solve for x
    x = 4,023,893.62/2,129.29
  6. Step 6: Final answer
    x = 1,889.78

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1.5x scale

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.