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Finding the Fourth Proportional to 421.18, 631.71 and 113.05

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Solution

The fourth proportional to 421.18, 631.71 and 113.05 is: 169.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.18 : 631.71 = 113.05 : x
  2. Step 2: Convert to fraction form
    421.18/631.71 = 113.05/x
  3. Step 3: Cross multiply
    421.18x = 631.71 × 113.05
  4. Step 4: Simplify right side
    421.18x = 71,414.82
  5. Step 5: Solve for x
    x = 71,414.82/421.18
  6. Step 6: Final answer
    x = 169.56

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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.