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Finding the Fourth Proportional to 757.58, 1,138.20 and 666.44

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Solution

The fourth proportional to 757.58, 1,138.20 and 666.44 is: 1,001.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.58 : 1,138.20 = 666.44 : x
  2. Step 2: Convert to fraction form
    757.58/1,138.20 = 666.44/x
  3. Step 3: Cross multiply
    757.58x = 1,138.20 × 666.44
  4. Step 4: Simplify right side
    757.58x = 758,542.01
  5. Step 5: Solve for x
    x = 758,542.01/757.58
  6. Step 6: Final answer
    x = 1,001.27

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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.