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Finding the Fourth Proportional to 266.85, 399.38 and 220.86

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Solution

The fourth proportional to 266.85, 399.38 and 220.86 is: 330.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.85 : 399.38 = 220.86 : x
  2. Step 2: Convert to fraction form
    266.85/399.38 = 220.86/x
  3. Step 3: Cross multiply
    266.85x = 399.38 × 220.86
  4. Step 4: Simplify right side
    266.85x = 88,205.96
  5. Step 5: Solve for x
    x = 88,205.96/266.85
  6. Step 6: Final answer
    x = 330.55

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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.