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Finding the Fourth Proportional to 667.43, 921.05 and 387.60

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Solution

The fourth proportional to 667.43, 921.05 and 387.60 is: 534.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.43 : 921.05 = 387.60 : x
  2. Step 2: Convert to fraction form
    667.43/921.05 = 387.60/x
  3. Step 3: Cross multiply
    667.43x = 921.05 × 387.60
  4. Step 4: Simplify right side
    667.43x = 356,997.04
  5. Step 5: Solve for x
    x = 356,997.04/667.43
  6. Step 6: Final answer
    x = 534.89

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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.