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Finding the Fourth Proportional to 310.86, 428.94 and 276.03

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Solution

The fourth proportional to 310.86, 428.94 and 276.03 is: 380.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.86 : 428.94 = 276.03 : x
  2. Step 2: Convert to fraction form
    310.86/428.94 = 276.03/x
  3. Step 3: Cross multiply
    310.86x = 428.94 × 276.03
  4. Step 4: Simplify right side
    310.86x = 118,400.31
  5. Step 5: Solve for x
    x = 118,400.31/310.86
  6. Step 6: Final answer
    x = 380.88

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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.