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Finding the Fourth Proportional to 426.34, 639.26 and 137.62

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Solution

The fourth proportional to 426.34, 639.26 and 137.62 is: 206.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.34 : 639.26 = 137.62 : x
  2. Step 2: Convert to fraction form
    426.34/639.26 = 137.62/x
  3. Step 3: Cross multiply
    426.34x = 639.26 × 137.62
  4. Step 4: Simplify right side
    426.34x = 87,974.96
  5. Step 5: Solve for x
    x = 87,974.96/426.34
  6. Step 6: Final answer
    x = 206.35

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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.