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Finding the Fourth Proportional to 3,138.80, 4,333 and 1,960.64

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Solution

The fourth proportional to 3,138.80, 4,333 and 1,960.64 is: 2,706.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,138.80 : 4,333 = 1,960.64 : x
  2. Step 2: Convert to fraction form
    3,138.80/4,333 = 1,960.64/x
  3. Step 3: Cross multiply
    3,138.80x = 4,333 × 1,960.64
  4. Step 4: Simplify right side
    3,138.80x = 8,495,453.12
  5. Step 5: Solve for x
    x = 8,495,453.12/3,138.80
  6. Step 6: Final answer
    x = 2,706.59

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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.