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Finding the Fourth Proportional to 408.45, 611.13 and 243.31

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Solution

The fourth proportional to 408.45, 611.13 and 243.31 is: 364.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.45 : 611.13 = 243.31 : x
  2. Step 2: Convert to fraction form
    408.45/611.13 = 243.31/x
  3. Step 3: Cross multiply
    408.45x = 611.13 × 243.31
  4. Step 4: Simplify right side
    408.45x = 148,692.51
  5. Step 5: Solve for x
    x = 148,692.51/408.45
  6. Step 6: Final answer
    x = 364.04

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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.