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Finding the Fourth Proportional to 423.12, 634.68 and 134.56

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Solution

The fourth proportional to 423.12, 634.68 and 134.56 is: 201.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.12 : 634.68 = 134.56 : x
  2. Step 2: Convert to fraction form
    423.12/634.68 = 134.56/x
  3. Step 3: Cross multiply
    423.12x = 634.68 × 134.56
  4. Step 4: Simplify right side
    423.12x = 85,402.54
  5. Step 5: Solve for x
    x = 85,402.54/423.12
  6. Step 6: Final answer
    x = 201.84

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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.