Home / 3,989.40-5,505.48-2,220.90

Finding the Fourth Proportional to 3,989.40, 5,505.48 and 2,220.90

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Solution

The fourth proportional to 3,989.40, 5,505.48 and 2,220.90 is: 3,064.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.40 : 5,505.48 = 2,220.90 : x
  2. Step 2: Convert to fraction form
    3,989.40/5,505.48 = 2,220.90/x
  3. Step 3: Cross multiply
    3,989.40x = 5,505.48 × 2,220.90
  4. Step 4: Simplify right side
    3,989.40x = 12,227,120.53
  5. Step 5: Solve for x
    x = 12,227,120.53/3,989.40
  6. Step 6: Final answer
    x = 3,064.90

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.