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Finding the Fourth Proportional to 421, 631.38 and 238.64

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Solution

The fourth proportional to 421, 631.38 and 238.64 is: 357.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    421 : 631.38 = 238.64 : x
  2. Step 2: Convert to fraction form
    421/631.38 = 238.64/x
  3. Step 3: Cross multiply
    421x = 631.38 × 238.64
  4. Step 4: Simplify right side
    421x = 150,672.52
  5. Step 5: Solve for x
    x = 150,672.52/421
  6. Step 6: Final answer
    x = 357.89

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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.