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Finding the Fourth Proportional to 408.51, 612.86 and 216.09

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Solution

The fourth proportional to 408.51, 612.86 and 216.09 is: 324.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.51 : 612.86 = 216.09 : x
  2. Step 2: Convert to fraction form
    408.51/612.86 = 216.09/x
  3. Step 3: Cross multiply
    408.51x = 612.86 × 216.09
  4. Step 4: Simplify right side
    408.51x = 132,431.84
  5. Step 5: Solve for x
    x = 132,431.84/408.51
  6. Step 6: Final answer
    x = 324.18

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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.