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Finding the Fourth Proportional to 267.06, 399.90 and 221.58

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Solution

The fourth proportional to 267.06, 399.90 and 221.58 is: 331.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    267.06 : 399.90 = 221.58 : x
  2. Step 2: Convert to fraction form
    267.06/399.90 = 221.58/x
  3. Step 3: Cross multiply
    267.06x = 399.90 × 221.58
  4. Step 4: Simplify right side
    267.06x = 88,609.84
  5. Step 5: Solve for x
    x = 88,609.84/267.06
  6. Step 6: Final answer
    x = 331.80

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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.