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Finding the Fourth Proportional to 322.11, 481.77 and 261.05

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Solution

The fourth proportional to 322.11, 481.77 and 261.05 is: 390.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.11 : 481.77 = 261.05 : x
  2. Step 2: Convert to fraction form
    322.11/481.77 = 261.05/x
  3. Step 3: Cross multiply
    322.11x = 481.77 × 261.05
  4. Step 4: Simplify right side
    322.11x = 125,763.65
  5. Step 5: Solve for x
    x = 125,763.65/322.11
  6. Step 6: Final answer
    x = 390.44

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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.