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Finding the Fourth Proportional to 321.32, 442.80 and 216.32

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Solution

The fourth proportional to 321.32, 442.80 and 216.32 is: 298.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.32 : 442.80 = 216.32 : x
  2. Step 2: Convert to fraction form
    321.32/442.80 = 216.32/x
  3. Step 3: Cross multiply
    321.32x = 442.80 × 216.32
  4. Step 4: Simplify right side
    321.32x = 95,786.50
  5. Step 5: Solve for x
    x = 95,786.50/321.32
  6. Step 6: Final answer
    x = 298.10

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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.