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Finding the Fourth Proportional to 309.69, 463.78 and 217.96

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Solution

The fourth proportional to 309.69, 463.78 and 217.96 is: 326.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.69 : 463.78 = 217.96 : x
  2. Step 2: Convert to fraction form
    309.69/463.78 = 217.96/x
  3. Step 3: Cross multiply
    309.69x = 463.78 × 217.96
  4. Step 4: Simplify right side
    309.69x = 101,083.38
  5. Step 5: Solve for x
    x = 101,083.38/309.69
  6. Step 6: Final answer
    x = 326.40

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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.