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Finding the Fourth Proportional to 665.43, 998.13 and 203.21

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Solution

The fourth proportional to 665.43, 998.13 and 203.21 is: 304.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.43 : 998.13 = 203.21 : x
  2. Step 2: Convert to fraction form
    665.43/998.13 = 203.21/x
  3. Step 3: Cross multiply
    665.43x = 998.13 × 203.21
  4. Step 4: Simplify right side
    665.43x = 202,825.01
  5. Step 5: Solve for x
    x = 202,825.01/665.43
  6. Step 6: Final answer
    x = 304.80

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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.