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Finding the Fourth Proportional to 494.90, 742.18 and 221.24

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Solution

The fourth proportional to 494.90, 742.18 and 221.24 is: 331.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.90 : 742.18 = 221.24 : x
  2. Step 2: Convert to fraction form
    494.90/742.18 = 221.24/x
  3. Step 3: Cross multiply
    494.90x = 742.18 × 221.24
  4. Step 4: Simplify right side
    494.90x = 164,199.90
  5. Step 5: Solve for x
    x = 164,199.90/494.90
  6. Step 6: Final answer
    x = 331.78

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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.