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Finding the Fourth Proportional to 2,987.21, 4,480.22 and 2,839.02

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Solution

The fourth proportional to 2,987.21, 4,480.22 and 2,839.02 is: 4,257.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.21 : 4,480.22 = 2,839.02 : x
  2. Step 2: Convert to fraction form
    2,987.21/4,480.22 = 2,839.02/x
  3. Step 3: Cross multiply
    2,987.21x = 4,480.22 × 2,839.02
  4. Step 4: Simplify right side
    2,987.21x = 12,719,435.40
  5. Step 5: Solve for x
    x = 12,719,435.40/2,987.21
  6. Step 6: Final answer
    x = 4,257.96

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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.