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Finding the Fourth Proportional to 666.22, 999.09 and 319.54

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Solution

The fourth proportional to 666.22, 999.09 and 319.54 is: 479.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.22 : 999.09 = 319.54 : x
  2. Step 2: Convert to fraction form
    666.22/999.09 = 319.54/x
  3. Step 3: Cross multiply
    666.22x = 999.09 × 319.54
  4. Step 4: Simplify right side
    666.22x = 319,249.22
  5. Step 5: Solve for x
    x = 319,249.22/666.22
  6. Step 6: Final answer
    x = 479.19

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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.