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Finding the Fourth Proportional to 664.56, 994.86 and 403.77

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Solution

The fourth proportional to 664.56, 994.86 and 403.77 is: 604.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.56 : 994.86 = 403.77 : x
  2. Step 2: Convert to fraction form
    664.56/994.86 = 403.77/x
  3. Step 3: Cross multiply
    664.56x = 994.86 × 403.77
  4. Step 4: Simplify right side
    664.56x = 401,694.62
  5. Step 5: Solve for x
    x = 401,694.62/664.56
  6. Step 6: Final answer
    x = 604.45

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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.