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Finding the Fourth Proportional to 282.10, 422.79 and 217.66

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Solution

The fourth proportional to 282.10, 422.79 and 217.66 is: 326.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.10 : 422.79 = 217.66 : x
  2. Step 2: Convert to fraction form
    282.10/422.79 = 217.66/x
  3. Step 3: Cross multiply
    282.10x = 422.79 × 217.66
  4. Step 4: Simplify right side
    282.10x = 92,024.47
  5. Step 5: Solve for x
    x = 92,024.47/282.10
  6. Step 6: Final answer
    x = 326.21

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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.