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Finding the Fourth Proportional to 408.99, 564.30 and 243.12

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Solution

The fourth proportional to 408.99, 564.30 and 243.12 is: 335.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.99 : 564.30 = 243.12 : x
  2. Step 2: Convert to fraction form
    408.99/564.30 = 243.12/x
  3. Step 3: Cross multiply
    408.99x = 564.30 × 243.12
  4. Step 4: Simplify right side
    408.99x = 137,192.62
  5. Step 5: Solve for x
    x = 137,192.62/408.99
  6. Step 6: Final answer
    x = 335.44

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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.