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Finding the Fourth Proportional to 668.78, 1,003.06 and 200.25

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Solution

The fourth proportional to 668.78, 1,003.06 and 200.25 is: 300.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.78 : 1,003.06 = 200.25 : x
  2. Step 2: Convert to fraction form
    668.78/1,003.06 = 200.25/x
  3. Step 3: Cross multiply
    668.78x = 1,003.06 × 200.25
  4. Step 4: Simplify right side
    668.78x = 200,857.75
  5. Step 5: Solve for x
    x = 200,857.75/668.78
  6. Step 6: Final answer
    x = 300.33

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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.