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Finding the Fourth Proportional to 667.66, 1,001.49 and 393.58

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Solution

The fourth proportional to 667.66, 1,001.49 and 393.58 is: 590.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.66 : 1,001.49 = 393.58 : x
  2. Step 2: Convert to fraction form
    667.66/1,001.49 = 393.58/x
  3. Step 3: Cross multiply
    667.66x = 1,001.49 × 393.58
  4. Step 4: Simplify right side
    667.66x = 394,166.43
  5. Step 5: Solve for x
    x = 394,166.43/667.66
  6. Step 6: Final answer
    x = 590.37

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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.