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Finding the Fourth Proportional to 2,145.80, 3,213.84 and 1,680.68

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Solution

The fourth proportional to 2,145.80, 3,213.84 and 1,680.68 is: 2,517.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,145.80 : 3,213.84 = 1,680.68 : x
  2. Step 2: Convert to fraction form
    2,145.80/3,213.84 = 1,680.68/x
  3. Step 3: Cross multiply
    2,145.80x = 3,213.84 × 1,680.68
  4. Step 4: Simplify right side
    2,145.80x = 5,401,436.61
  5. Step 5: Solve for x
    x = 5,401,436.61/2,145.80
  6. Step 6: Final answer
    x = 2,517.21

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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.