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Finding the Fourth Proportional to 664.93, 997.32 and 387.44

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Solution

The fourth proportional to 664.93, 997.32 and 387.44 is: 581.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.93 : 997.32 = 387.44 : x
  2. Step 2: Convert to fraction form
    664.93/997.32 = 387.44/x
  3. Step 3: Cross multiply
    664.93x = 997.32 × 387.44
  4. Step 4: Simplify right side
    664.93x = 386,399.72
  5. Step 5: Solve for x
    x = 386,399.72/664.93
  6. Step 6: Final answer
    x = 581.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.