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Finding the Fourth Proportional to 1,213.55, 1,819.93 and 628.48

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Solution

The fourth proportional to 1,213.55, 1,819.93 and 628.48 is: 942.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.55 : 1,819.93 = 628.48 : x
  2. Step 2: Convert to fraction form
    1,213.55/1,819.93 = 628.48/x
  3. Step 3: Cross multiply
    1,213.55x = 1,819.93 × 628.48
  4. Step 4: Simplify right side
    1,213.55x = 1,143,789.61
  5. Step 5: Solve for x
    x = 1,143,789.61/1,213.55
  6. Step 6: Final answer
    x = 942.52

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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.