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Finding the Fourth Proportional to 1,212.68, 1,819.20 and 443

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Solution

The fourth proportional to 1,212.68, 1,819.20 and 443 is: 664.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.68 : 1,819.20 = 443 : x
  2. Step 2: Convert to fraction form
    1,212.68/1,819.20 = 443/x
  3. Step 3: Cross multiply
    1,212.68x = 1,819.20 × 443
  4. Step 4: Simplify right side
    1,212.68x = 805,905.60
  5. Step 5: Solve for x
    x = 805,905.60/1,212.68
  6. Step 6: Final answer
    x = 664.57

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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.