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Finding the Fourth Proportional to 409.32, 612.90 and 216.54

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Solution

The fourth proportional to 409.32, 612.90 and 216.54 is: 324.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.32 : 612.90 = 216.54 : x
  2. Step 2: Convert to fraction form
    409.32/612.90 = 216.54/x
  3. Step 3: Cross multiply
    409.32x = 612.90 × 216.54
  4. Step 4: Simplify right side
    409.32x = 132,717.37
  5. Step 5: Solve for x
    x = 132,717.37/409.32
  6. Step 6: Final answer
    x = 324.24

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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.