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Finding the Fourth Proportional to 664.02, 994.91 and 638.73

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Solution

The fourth proportional to 664.02, 994.91 and 638.73 is: 957.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.02 : 994.91 = 638.73 : x
  2. Step 2: Convert to fraction form
    664.02/994.91 = 638.73/x
  3. Step 3: Cross multiply
    664.02x = 994.91 × 638.73
  4. Step 4: Simplify right side
    664.02x = 635,475.67
  5. Step 5: Solve for x
    x = 635,475.67/664.02
  6. Step 6: Final answer
    x = 957.01

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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.