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Finding the Fourth Proportional to 667.53, 921.05 and 387.61

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Solution

The fourth proportional to 667.53, 921.05 and 387.61 is: 534.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.53 : 921.05 = 387.61 : x
  2. Step 2: Convert to fraction form
    667.53/921.05 = 387.61/x
  3. Step 3: Cross multiply
    667.53x = 921.05 × 387.61
  4. Step 4: Simplify right side
    667.53x = 357,002.62
  5. Step 5: Solve for x
    x = 357,002.62/667.53
  6. Step 6: Final answer
    x = 534.81

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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.