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Finding the Fourth Proportional to 667.44, 921.24 and 418.68

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Solution

The fourth proportional to 667.44, 921.24 and 418.68 is: 577.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.44 : 921.24 = 418.68 : x
  2. Step 2: Convert to fraction form
    667.44/921.24 = 418.68/x
  3. Step 3: Cross multiply
    667.44x = 921.24 × 418.68
  4. Step 4: Simplify right side
    667.44x = 385,704.76
  5. Step 5: Solve for x
    x = 385,704.76/667.44
  6. Step 6: Final answer
    x = 577.89

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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.