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Finding the Fourth Proportional to 234.20, 321.99 and 209.07

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Solution

The fourth proportional to 234.20, 321.99 and 209.07 is: 287.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    234.20 : 321.99 = 209.07 : x
  2. Step 2: Convert to fraction form
    234.20/321.99 = 209.07/x
  3. Step 3: Cross multiply
    234.20x = 321.99 × 209.07
  4. Step 4: Simplify right side
    234.20x = 67,318.45
  5. Step 5: Solve for x
    x = 67,318.45/234.20
  6. Step 6: Final answer
    x = 287.45

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.