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Finding the Fourth Proportional to 3,678.92, 5,517.21 and 1,213.28

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Solution

The fourth proportional to 3,678.92, 5,517.21 and 1,213.28 is: 1,819.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,678.92 : 5,517.21 = 1,213.28 : x
  2. Step 2: Convert to fraction form
    3,678.92/5,517.21 = 1,213.28/x
  3. Step 3: Cross multiply
    3,678.92x = 5,517.21 × 1,213.28
  4. Step 4: Simplify right side
    3,678.92x = 6,693,920.55
  5. Step 5: Solve for x
    x = 6,693,920.55/3,678.92
  6. Step 6: Final answer
    x = 1,819.53

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1.5x scale

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.