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Finding the Fourth Proportional to 664.87, 996.48 and 391.16

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Solution

The fourth proportional to 664.87, 996.48 and 391.16 is: 586.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.87 : 996.48 = 391.16 : x
  2. Step 2: Convert to fraction form
    664.87/996.48 = 391.16/x
  3. Step 3: Cross multiply
    664.87x = 996.48 × 391.16
  4. Step 4: Simplify right side
    664.87x = 389,783.12
  5. Step 5: Solve for x
    x = 389,783.12/664.87
  6. Step 6: Final answer
    x = 586.25

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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.