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Finding the Fourth Proportional to 310.34, 428.04 and 199.70

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Solution

The fourth proportional to 310.34, 428.04 and 199.70 is: 275.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.34 : 428.04 = 199.70 : x
  2. Step 2: Convert to fraction form
    310.34/428.04 = 199.70/x
  3. Step 3: Cross multiply
    310.34x = 428.04 × 199.70
  4. Step 4: Simplify right side
    310.34x = 85,479.91
  5. Step 5: Solve for x
    x = 85,479.91/310.34
  6. Step 6: Final answer
    x = 275.44

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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.