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Finding the Fourth Proportional to 310.63, 428.77 and 200.11

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Solution

The fourth proportional to 310.63, 428.77 and 200.11 is: 276.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.63 : 428.77 = 200.11 : x
  2. Step 2: Convert to fraction form
    310.63/428.77 = 200.11/x
  3. Step 3: Cross multiply
    310.63x = 428.77 × 200.11
  4. Step 4: Simplify right side
    310.63x = 85,800.09
  5. Step 5: Solve for x
    x = 85,800.09/310.63
  6. Step 6: Final answer
    x = 276.21

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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.