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Finding the Fourth Proportional to 426.05, 639.12 and 272.10

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Solution

The fourth proportional to 426.05, 639.12 and 272.10 is: 408.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.05 : 639.12 = 272.10 : x
  2. Step 2: Convert to fraction form
    426.05/639.12 = 272.10/x
  3. Step 3: Cross multiply
    426.05x = 639.12 × 272.10
  4. Step 4: Simplify right side
    426.05x = 173,904.55
  5. Step 5: Solve for x
    x = 173,904.55/426.05
  6. Step 6: Final answer
    x = 408.18

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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.