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Finding the Fourth Proportional to 665.79, 998.11 and 254.64

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Solution

The fourth proportional to 665.79, 998.11 and 254.64 is: 381.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.79 : 998.11 = 254.64 : x
  2. Step 2: Convert to fraction form
    665.79/998.11 = 254.64/x
  3. Step 3: Cross multiply
    665.79x = 998.11 × 254.64
  4. Step 4: Simplify right side
    665.79x = 254,157.89
  5. Step 5: Solve for x
    x = 254,157.89/665.79
  6. Step 6: Final answer
    x = 381.74

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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.