Home / 3,985.20-5,977.79-1,211.86

Finding the Fourth Proportional to 3,985.20, 5,977.79 and 1,211.86

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Solution

The fourth proportional to 3,985.20, 5,977.79 and 1,211.86 is: 1,817.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,985.20 : 5,977.79 = 1,211.86 : x
  2. Step 2: Convert to fraction form
    3,985.20/5,977.79 = 1,211.86/x
  3. Step 3: Cross multiply
    3,985.20x = 5,977.79 × 1,211.86
  4. Step 4: Simplify right side
    3,985.20x = 7,244,223.59
  5. Step 5: Solve for x
    x = 7,244,223.59/3,985.20
  6. Step 6: Final answer
    x = 1,817.78

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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.