Home / 2,138.22-2,951.40-1,390.86

Finding the Fourth Proportional to 2,138.22, 2,951.40 and 1,390.86

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Solution

The fourth proportional to 2,138.22, 2,951.40 and 1,390.86 is: 1,919.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.22 : 2,951.40 = 1,390.86 : x
  2. Step 2: Convert to fraction form
    2,138.22/2,951.40 = 1,390.86/x
  3. Step 3: Cross multiply
    2,138.22x = 2,951.40 × 1,390.86
  4. Step 4: Simplify right side
    2,138.22x = 4,104,984.20
  5. Step 5: Solve for x
    x = 4,104,984.20/2,138.22
  6. Step 6: Final answer
    x = 1,919.81

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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.