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Finding the Fourth Proportional to 408.16, 612.64 and 215.92

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Solution

The fourth proportional to 408.16, 612.64 and 215.92 is: 324.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.16 : 612.64 = 215.92 : x
  2. Step 2: Convert to fraction form
    408.16/612.64 = 215.92/x
  3. Step 3: Cross multiply
    408.16x = 612.64 × 215.92
  4. Step 4: Simplify right side
    408.16x = 132,281.23
  5. Step 5: Solve for x
    x = 132,281.23/408.16
  6. Step 6: Final answer
    x = 324.09

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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.