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Finding the Fourth Proportional to 310.91, 428.97 and 200.53

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Solution

The fourth proportional to 310.91, 428.97 and 200.53 is: 276.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.91 : 428.97 = 200.53 : x
  2. Step 2: Convert to fraction form
    310.91/428.97 = 200.53/x
  3. Step 3: Cross multiply
    310.91x = 428.97 × 200.53
  4. Step 4: Simplify right side
    310.91x = 86,020.28
  5. Step 5: Solve for x
    x = 86,020.28/310.91
  6. Step 6: Final answer
    x = 276.67

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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.