Home / 3,911.21-5,866.20-1,278.70

Finding the Fourth Proportional to 3,911.21, 5,866.20 and 1,278.70

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Solution

The fourth proportional to 3,911.21, 5,866.20 and 1,278.70 is: 1,917.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.21 : 5,866.20 = 1,278.70 : x
  2. Step 2: Convert to fraction form
    3,911.21/5,866.20 = 1,278.70/x
  3. Step 3: Cross multiply
    3,911.21x = 5,866.20 × 1,278.70
  4. Step 4: Simplify right side
    3,911.21x = 7,501,099.93
  5. Step 5: Solve for x
    x = 7,501,099.93/3,911.21
  6. Step 6: Final answer
    x = 1,917.85

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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.