Home / 3,905.76-5,390.12-2,137.28

Finding the Fourth Proportional to 3,905.76, 5,390.12 and 2,137.28

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Solution

The fourth proportional to 3,905.76, 5,390.12 and 2,137.28 is: 2,949.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,905.76 : 5,390.12 = 2,137.28 : x
  2. Step 2: Convert to fraction form
    3,905.76/5,390.12 = 2,137.28/x
  3. Step 3: Cross multiply
    3,905.76x = 5,390.12 × 2,137.28
  4. Step 4: Simplify right side
    3,905.76x = 11,520,195.67
  5. Step 5: Solve for x
    x = 11,520,195.67/3,905.76
  6. Step 6: Final answer
    x = 2,949.54

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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.