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Finding the Fourth Proportional to 421.35, 631.17 and 238.56

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Solution

The fourth proportional to 421.35, 631.17 and 238.56 is: 357.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.35 : 631.17 = 238.56 : x
  2. Step 2: Convert to fraction form
    421.35/631.17 = 238.56/x
  3. Step 3: Cross multiply
    421.35x = 631.17 × 238.56
  4. Step 4: Simplify right side
    421.35x = 150,571.92
  5. Step 5: Solve for x
    x = 150,571.92/421.35
  6. Step 6: Final answer
    x = 357.36

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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.