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Finding the Fourth Proportional to 310.68, 428.49 and 217.26

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Solution

The fourth proportional to 310.68, 428.49 and 217.26 is: 299.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.68 : 428.49 = 217.26 : x
  2. Step 2: Convert to fraction form
    310.68/428.49 = 217.26/x
  3. Step 3: Cross multiply
    310.68x = 428.49 × 217.26
  4. Step 4: Simplify right side
    310.68x = 93,093.74
  5. Step 5: Solve for x
    x = 93,093.74/310.68
  6. Step 6: Final answer
    x = 299.65

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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.