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Finding the Fourth Proportional to 308.10, 462.28 and 221.68

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Solution

The fourth proportional to 308.10, 462.28 and 221.68 is: 332.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.10 : 462.28 = 221.68 : x
  2. Step 2: Convert to fraction form
    308.10/462.28 = 221.68/x
  3. Step 3: Cross multiply
    308.10x = 462.28 × 221.68
  4. Step 4: Simplify right side
    308.10x = 102,478.23
  5. Step 5: Solve for x
    x = 102,478.23/308.10
  6. Step 6: Final answer
    x = 332.61

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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.