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Finding the Fourth Proportional to 310.42, 428.23 and 199.85

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Solution

The fourth proportional to 310.42, 428.23 and 199.85 is: 275.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.42 : 428.23 = 199.85 : x
  2. Step 2: Convert to fraction form
    310.42/428.23 = 199.85/x
  3. Step 3: Cross multiply
    310.42x = 428.23 × 199.85
  4. Step 4: Simplify right side
    310.42x = 85,582.34
  5. Step 5: Solve for x
    x = 85,582.34/310.42
  6. Step 6: Final answer
    x = 275.70

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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.