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Finding the Fourth Proportional to 421.31, 631.92 and 113.19

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Solution

The fourth proportional to 421.31, 631.92 and 113.19 is: 169.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.31 : 631.92 = 113.19 : x
  2. Step 2: Convert to fraction form
    421.31/631.92 = 113.19/x
  3. Step 3: Cross multiply
    421.31x = 631.92 × 113.19
  4. Step 4: Simplify right side
    421.31x = 71,523.30
  5. Step 5: Solve for x
    x = 71,523.30/421.31
  6. Step 6: Final answer
    x = 169.76

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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.