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Finding the Fourth Proportional to 426.66, 641.13 and 231.81

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Solution

The fourth proportional to 426.66, 641.13 and 231.81 is: 348.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.66 : 641.13 = 231.81 : x
  2. Step 2: Convert to fraction form
    426.66/641.13 = 231.81/x
  3. Step 3: Cross multiply
    426.66x = 641.13 × 231.81
  4. Step 4: Simplify right side
    426.66x = 148,620.35
  5. Step 5: Solve for x
    x = 148,620.35/426.66
  6. Step 6: Final answer
    x = 348.33

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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.