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Finding the Fourth Proportional to 310.44, 428.05 and 281.28

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Solution

The fourth proportional to 310.44, 428.05 and 281.28 is: 387.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.44 : 428.05 = 281.28 : x
  2. Step 2: Convert to fraction form
    310.44/428.05 = 281.28/x
  3. Step 3: Cross multiply
    310.44x = 428.05 × 281.28
  4. Step 4: Simplify right side
    310.44x = 120,401.45
  5. Step 5: Solve for x
    x = 120,401.45/310.44
  6. Step 6: Final answer
    x = 387.84

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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.