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Finding the Fourth Proportional to 1,213.37, 1,819.68 and 628.19

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Solution

The fourth proportional to 1,213.37, 1,819.68 and 628.19 is: 942.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.37 : 1,819.68 = 628.19 : x
  2. Step 2: Convert to fraction form
    1,213.37/1,819.68 = 628.19/x
  3. Step 3: Cross multiply
    1,213.37x = 1,819.68 × 628.19
  4. Step 4: Simplify right side
    1,213.37x = 1,143,104.78
  5. Step 5: Solve for x
    x = 1,143,104.78/1,213.37
  6. Step 6: Final answer
    x = 942.09

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Double scale
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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.