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Finding the Fourth Proportional to 667.48, 921.21 and 481.58

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Solution

The fourth proportional to 667.48, 921.21 and 481.58 is: 664.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.48 : 921.21 = 481.58 : x
  2. Step 2: Convert to fraction form
    667.48/921.21 = 481.58/x
  3. Step 3: Cross multiply
    667.48x = 921.21 × 481.58
  4. Step 4: Simplify right side
    667.48x = 443,636.31
  5. Step 5: Solve for x
    x = 443,636.31/667.48
  6. Step 6: Final answer
    x = 664.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.