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Finding the Fourth Proportional to 409.25, 564.80 and 320.85

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Solution

The fourth proportional to 409.25, 564.80 and 320.85 is: 442.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.25 : 564.80 = 320.85 : x
  2. Step 2: Convert to fraction form
    409.25/564.80 = 320.85/x
  3. Step 3: Cross multiply
    409.25x = 564.80 × 320.85
  4. Step 4: Simplify right side
    409.25x = 181,214.48
  5. Step 5: Solve for x
    x = 181,214.48/409.25
  6. Step 6: Final answer
    x = 442.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.