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Finding the Fourth Proportional to 668.80, 1,003.11 and 252.28

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Solution

The fourth proportional to 668.80, 1,003.11 and 252.28 is: 378.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.80 : 1,003.11 = 252.28 : x
  2. Step 2: Convert to fraction form
    668.80/1,003.11 = 252.28/x
  3. Step 3: Cross multiply
    668.80x = 1,003.11 × 252.28
  4. Step 4: Simplify right side
    668.80x = 253,064.59
  5. Step 5: Solve for x
    x = 253,064.59/668.80
  6. Step 6: Final answer
    x = 378.39

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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.