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Finding the Fourth Proportional to 310.74, 428.79 and 192.88

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Solution

The fourth proportional to 310.74, 428.79 and 192.88 is: 266.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.74 : 428.79 = 192.88 : x
  2. Step 2: Convert to fraction form
    310.74/428.79 = 192.88/x
  3. Step 3: Cross multiply
    310.74x = 428.79 × 192.88
  4. Step 4: Simplify right side
    310.74x = 82,706.27
  5. Step 5: Solve for x
    x = 82,706.27/310.74
  6. Step 6: Final answer
    x = 266.16

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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.