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Finding the Fourth Proportional to 426.35, 639.09 and 272.39

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Solution

The fourth proportional to 426.35, 639.09 and 272.39 is: 408.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.35 : 639.09 = 272.39 : x
  2. Step 2: Convert to fraction form
    426.35/639.09 = 272.39/x
  3. Step 3: Cross multiply
    426.35x = 639.09 × 272.39
  4. Step 4: Simplify right side
    426.35x = 174,080.33
  5. Step 5: Solve for x
    x = 174,080.33/426.35
  6. Step 6: Final answer
    x = 408.30

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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.