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Finding the Fourth Proportional to 421.41, 631.99 and 161.22

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Solution

The fourth proportional to 421.41, 631.99 and 161.22 is: 241.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.41 : 631.99 = 161.22 : x
  2. Step 2: Convert to fraction form
    421.41/631.99 = 161.22/x
  3. Step 3: Cross multiply
    421.41x = 631.99 × 161.22
  4. Step 4: Simplify right side
    421.41x = 101,889.43
  5. Step 5: Solve for x
    x = 101,889.43/421.41
  6. Step 6: Final answer
    x = 241.78

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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.