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Finding the Fourth Proportional to 664.69, 990.01 and 629.99

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Solution

The fourth proportional to 664.69, 990.01 and 629.99 is: 938.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.69 : 990.01 = 629.99 : x
  2. Step 2: Convert to fraction form
    664.69/990.01 = 629.99/x
  3. Step 3: Cross multiply
    664.69x = 990.01 × 629.99
  4. Step 4: Simplify right side
    664.69x = 623,698.87
  5. Step 5: Solve for x
    x = 623,698.87/664.69
  6. Step 6: Final answer
    x = 938.33

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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.