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Finding the Fourth Proportional to 1,208.20, 1,809.78 and 629.32

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Solution

The fourth proportional to 1,208.20, 1,809.78 and 629.32 is: 942.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.20 : 1,809.78 = 629.32 : x
  2. Step 2: Convert to fraction form
    1,208.20/1,809.78 = 629.32/x
  3. Step 3: Cross multiply
    1,208.20x = 1,809.78 × 629.32
  4. Step 4: Simplify right side
    1,208.20x = 1,138,930.75
  5. Step 5: Solve for x
    x = 1,138,930.75/1,208.20
  6. Step 6: Final answer
    x = 942.67

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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.