Home / 2,781.72-3,831.03-2,149.92

Finding the Fourth Proportional to 2,781.72, 3,831.03 and 2,149.92

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Solution

The fourth proportional to 2,781.72, 3,831.03 and 2,149.92 is: 2,960.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,781.72 : 3,831.03 = 2,149.92 : x
  2. Step 2: Convert to fraction form
    2,781.72/3,831.03 = 2,149.92/x
  3. Step 3: Cross multiply
    2,781.72x = 3,831.03 × 2,149.92
  4. Step 4: Simplify right side
    2,781.72x = 8,236,408.02
  5. Step 5: Solve for x
    x = 8,236,408.02/2,781.72
  6. Step 6: Final answer
    x = 2,960.90

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1.5x scale

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.