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Finding the Fourth Proportional to 665.98, 998.91 and 254.81

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Solution

The fourth proportional to 665.98, 998.91 and 254.81 is: 382.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.98 : 998.91 = 254.81 : x
  2. Step 2: Convert to fraction form
    665.98/998.91 = 254.81/x
  3. Step 3: Cross multiply
    665.98x = 998.91 × 254.81
  4. Step 4: Simplify right side
    665.98x = 254,534.75
  5. Step 5: Solve for x
    x = 254,534.75/665.98
  6. Step 6: Final answer
    x = 382.20

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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.