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Finding the Fourth Proportional to 3,138.62, 4,707.86 and 1,680.62

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Solution

The fourth proportional to 3,138.62, 4,707.86 and 1,680.62 is: 2,520.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,138.62 : 4,707.86 = 1,680.62 : x
  2. Step 2: Convert to fraction form
    3,138.62/4,707.86 = 1,680.62/x
  3. Step 3: Cross multiply
    3,138.62x = 4,707.86 × 1,680.62
  4. Step 4: Simplify right side
    3,138.62x = 7,912,091.73
  5. Step 5: Solve for x
    x = 7,912,091.73/3,138.62
  6. Step 6: Final answer
    x = 2,520.89

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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.