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Finding the Fourth Proportional to 426.22, 639.40 and 137.62

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Solution

The fourth proportional to 426.22, 639.40 and 137.62 is: 206.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.22 : 639.40 = 137.62 : x
  2. Step 2: Convert to fraction form
    426.22/639.40 = 137.62/x
  3. Step 3: Cross multiply
    426.22x = 639.40 × 137.62
  4. Step 4: Simplify right side
    426.22x = 87,994.23
  5. Step 5: Solve for x
    x = 87,994.23/426.22
  6. Step 6: Final answer
    x = 206.45

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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.