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Finding the Fourth Proportional to 426.74, 639.88 and 134.12

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Solution

The fourth proportional to 426.74, 639.88 and 134.12 is: 201.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.74 : 639.88 = 134.12 : x
  2. Step 2: Convert to fraction form
    426.74/639.88 = 134.12/x
  3. Step 3: Cross multiply
    426.74x = 639.88 × 134.12
  4. Step 4: Simplify right side
    426.74x = 85,821.97
  5. Step 5: Solve for x
    x = 85,821.97/426.74
  6. Step 6: Final answer
    x = 201.11

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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.