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Finding the Fourth Proportional to 426.06, 638.63 and 220.42

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Solution

The fourth proportional to 426.06, 638.63 and 220.42 is: 330.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.06 : 638.63 = 220.42 : x
  2. Step 2: Convert to fraction form
    426.06/638.63 = 220.42/x
  3. Step 3: Cross multiply
    426.06x = 638.63 × 220.42
  4. Step 4: Simplify right side
    426.06x = 140,762.53
  5. Step 5: Solve for x
    x = 140,762.53/426.06
  6. Step 6: Final answer
    x = 330.39

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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.