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Finding the Fourth Proportional to 426.70, 639.64 and 272.19

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Solution

The fourth proportional to 426.70, 639.64 and 272.19 is: 408.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.70 : 639.64 = 272.19 : x
  2. Step 2: Convert to fraction form
    426.70/639.64 = 272.19/x
  3. Step 3: Cross multiply
    426.70x = 639.64 × 272.19
  4. Step 4: Simplify right side
    426.70x = 174,103.61
  5. Step 5: Solve for x
    x = 174,103.61/426.70
  6. Step 6: Final answer
    x = 408.02

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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.