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Finding the Fourth Proportional to 665.54, 998.15 and 254.56

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Solution

The fourth proportional to 665.54, 998.15 and 254.56 is: 381.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.54 : 998.15 = 254.56 : x
  2. Step 2: Convert to fraction form
    665.54/998.15 = 254.56/x
  3. Step 3: Cross multiply
    665.54x = 998.15 × 254.56
  4. Step 4: Simplify right side
    665.54x = 254,085.30
  5. Step 5: Solve for x
    x = 254,085.30/665.54
  6. Step 6: Final answer
    x = 381.77

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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.