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Finding the Fourth Proportional to 665.31, 998.29 and 254.61

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Solution

The fourth proportional to 665.31, 998.29 and 254.61 is: 382.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.31 : 998.29 = 254.61 : x
  2. Step 2: Convert to fraction form
    665.31/998.29 = 254.61/x
  3. Step 3: Cross multiply
    665.31x = 998.29 × 254.61
  4. Step 4: Simplify right side
    665.31x = 254,174.94
  5. Step 5: Solve for x
    x = 254,174.94/665.31
  6. Step 6: Final answer
    x = 382.04

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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.