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Finding the Fourth Proportional to 666.19, 999.31 and 255.26

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Solution

The fourth proportional to 666.19, 999.31 and 255.26 is: 382.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.19 : 999.31 = 255.26 : x
  2. Step 2: Convert to fraction form
    666.19/999.31 = 255.26/x
  3. Step 3: Cross multiply
    666.19x = 999.31 × 255.26
  4. Step 4: Simplify right side
    666.19x = 255,083.87
  5. Step 5: Solve for x
    x = 255,083.87/666.19
  6. Step 6: Final answer
    x = 382.90

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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.