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Finding the Fourth Proportional to 423, 634.64 and 134.44

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Solution

The fourth proportional to 423, 634.64 and 134.44 is: 201.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    423 : 634.64 = 134.44 : x
  2. Step 2: Convert to fraction form
    423/634.64 = 134.44/x
  3. Step 3: Cross multiply
    423x = 634.64 × 134.44
  4. Step 4: Simplify right side
    423x = 85,318.74
  5. Step 5: Solve for x
    x = 85,318.74/423
  6. Step 6: Final answer
    x = 201.70

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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.