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Finding the Fourth Proportional to 667.36, 920.92 and 387.61

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Solution

The fourth proportional to 667.36, 920.92 and 387.61 is: 534.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.36 : 920.92 = 387.61 : x
  2. Step 2: Convert to fraction form
    667.36/920.92 = 387.61/x
  3. Step 3: Cross multiply
    667.36x = 920.92 × 387.61
  4. Step 4: Simplify right side
    667.36x = 356,957.80
  5. Step 5: Solve for x
    x = 356,957.80/667.36
  6. Step 6: Final answer
    x = 534.88

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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.