Home / 3,999.21-5,518.82-2,320.78

Finding the Fourth Proportional to 3,999.21, 5,518.82 and 2,320.78

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Solution

The fourth proportional to 3,999.21, 5,518.82 and 2,320.78 is: 3,202.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,999.21 : 5,518.82 = 2,320.78 : x
  2. Step 2: Convert to fraction form
    3,999.21/5,518.82 = 2,320.78/x
  3. Step 3: Cross multiply
    3,999.21x = 5,518.82 × 2,320.78
  4. Step 4: Simplify right side
    3,999.21x = 12,807,967.08
  5. Step 5: Solve for x
    x = 12,807,967.08/3,999.21
  6. Step 6: Final answer
    x = 3,202.62

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1.5x scale

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.