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Finding the Fourth Proportional to 308.20, 462.42 and 216.88

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Solution

The fourth proportional to 308.20, 462.42 and 216.88 is: 325.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.20 : 462.42 = 216.88 : x
  2. Step 2: Convert to fraction form
    308.20/462.42 = 216.88/x
  3. Step 3: Cross multiply
    308.20x = 462.42 × 216.88
  4. Step 4: Simplify right side
    308.20x = 100,289.65
  5. Step 5: Solve for x
    x = 100,289.65/308.20
  6. Step 6: Final answer
    x = 325.40

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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.