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Finding the Fourth Proportional to 426.46, 639.11 and 220.59

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Solution

The fourth proportional to 426.46, 639.11 and 220.59 is: 330.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.46 : 639.11 = 220.59 : x
  2. Step 2: Convert to fraction form
    426.46/639.11 = 220.59/x
  3. Step 3: Cross multiply
    426.46x = 639.11 × 220.59
  4. Step 4: Simplify right side
    426.46x = 140,984.22
  5. Step 5: Solve for x
    x = 140,984.22/426.46
  6. Step 6: Final answer
    x = 330.59

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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.