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Finding the Fourth Proportional to 666.18, 999.33 and 406.05

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Solution

The fourth proportional to 666.18, 999.33 and 406.05 is: 609.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.18 : 999.33 = 406.05 : x
  2. Step 2: Convert to fraction form
    666.18/999.33 = 406.05/x
  3. Step 3: Cross multiply
    666.18x = 999.33 × 406.05
  4. Step 4: Simplify right side
    666.18x = 405,774.44
  5. Step 5: Solve for x
    x = 405,774.44/666.18
  6. Step 6: Final answer
    x = 609.11

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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.