Home / 3,919.20-5,877.12-1,320.96

Finding the Fourth Proportional to 3,919.20, 5,877.12 and 1,320.96

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Solution

The fourth proportional to 3,919.20, 5,877.12 and 1,320.96 is: 1,980.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,919.20 : 5,877.12 = 1,320.96 : x
  2. Step 2: Convert to fraction form
    3,919.20/5,877.12 = 1,320.96/x
  3. Step 3: Cross multiply
    3,919.20x = 5,877.12 × 1,320.96
  4. Step 4: Simplify right side
    3,919.20x = 7,763,440.44
  5. Step 5: Solve for x
    x = 7,763,440.44/3,919.20
  6. Step 6: Final answer
    x = 1,980.87

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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.