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Finding the Fourth Proportional to 664.56, 990.66 and 628.08

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Solution

The fourth proportional to 664.56, 990.66 and 628.08 is: 936.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.56 : 990.66 = 628.08 : x
  2. Step 2: Convert to fraction form
    664.56/990.66 = 628.08/x
  3. Step 3: Cross multiply
    664.56x = 990.66 × 628.08
  4. Step 4: Simplify right side
    664.56x = 622,213.73
  5. Step 5: Solve for x
    x = 622,213.73/664.56
  6. Step 6: Final answer
    x = 936.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.