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Finding the Fourth Proportional to 426.22, 638.12 and 262.80

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Solution

The fourth proportional to 426.22, 638.12 and 262.80 is: 393.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.22 : 638.12 = 262.80 : x
  2. Step 2: Convert to fraction form
    426.22/638.12 = 262.80/x
  3. Step 3: Cross multiply
    426.22x = 638.12 × 262.80
  4. Step 4: Simplify right side
    426.22x = 167,697.94
  5. Step 5: Solve for x
    x = 167,697.94/426.22
  6. Step 6: Final answer
    x = 393.45

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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.