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Finding the Fourth Proportional to 665.86, 998.19 and 255.01

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Solution

The fourth proportional to 665.86, 998.19 and 255.01 is: 382.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.86 : 998.19 = 255.01 : x
  2. Step 2: Convert to fraction form
    665.86/998.19 = 255.01/x
  3. Step 3: Cross multiply
    665.86x = 998.19 × 255.01
  4. Step 4: Simplify right side
    665.86x = 254,548.43
  5. Step 5: Solve for x
    x = 254,548.43/665.86
  6. Step 6: Final answer
    x = 382.29

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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.