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Finding the Fourth Proportional to 266.22, 399.40 and 220.76

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Solution

The fourth proportional to 266.22, 399.40 and 220.76 is: 331.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.22 : 399.40 = 220.76 : x
  2. Step 2: Convert to fraction form
    266.22/399.40 = 220.76/x
  3. Step 3: Cross multiply
    266.22x = 399.40 × 220.76
  4. Step 4: Simplify right side
    266.22x = 88,171.54
  5. Step 5: Solve for x
    x = 88,171.54/266.22
  6. Step 6: Final answer
    x = 331.20

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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.