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Finding the Fourth Proportional to 310.71, 428.69 and 192.70

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Solution

The fourth proportional to 310.71, 428.69 and 192.70 is: 265.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.71 : 428.69 = 192.70 : x
  2. Step 2: Convert to fraction form
    310.71/428.69 = 192.70/x
  3. Step 3: Cross multiply
    310.71x = 428.69 × 192.70
  4. Step 4: Simplify right side
    310.71x = 82,608.56
  5. Step 5: Solve for x
    x = 82,608.56/310.71
  6. Step 6: Final answer
    x = 265.87

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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.