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Finding the Fourth Proportional to 310.92, 428.19 and 248.57

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Solution

The fourth proportional to 310.92, 428.19 and 248.57 is: 342.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.92 : 428.19 = 248.57 : x
  2. Step 2: Convert to fraction form
    310.92/428.19 = 248.57/x
  3. Step 3: Cross multiply
    310.92x = 428.19 × 248.57
  4. Step 4: Simplify right side
    310.92x = 106,433.05
  5. Step 5: Solve for x
    x = 106,433.05/310.92
  6. Step 6: Final answer
    x = 342.32

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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.