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Finding the Fourth Proportional to 310.54, 428.68 and 217.42

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Solution

The fourth proportional to 310.54, 428.68 and 217.42 is: 300.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.54 : 428.68 = 217.42 : x
  2. Step 2: Convert to fraction form
    310.54/428.68 = 217.42/x
  3. Step 3: Cross multiply
    310.54x = 428.68 × 217.42
  4. Step 4: Simplify right side
    310.54x = 93,203.61
  5. Step 5: Solve for x
    x = 93,203.61/310.54
  6. Step 6: Final answer
    x = 300.13

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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.