Home / 3,138.60-4,331.30-2,019.90

Finding the Fourth Proportional to 3,138.60, 4,331.30 and 2,019.90

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Solution

The fourth proportional to 3,138.60, 4,331.30 and 2,019.90 is: 2,787.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,138.60 : 4,331.30 = 2,019.90 : x
  2. Step 2: Convert to fraction form
    3,138.60/4,331.30 = 2,019.90/x
  3. Step 3: Cross multiply
    3,138.60x = 4,331.30 × 2,019.90
  4. Step 4: Simplify right side
    3,138.60x = 8,748,782.77
  5. Step 5: Solve for x
    x = 8,748,782.77/3,138.60
  6. Step 6: Final answer
    x = 2,787.48

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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.