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Finding the Fourth Proportional to 310.48, 428.02 and 192.38

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Solution

The fourth proportional to 310.48, 428.02 and 192.38 is: 265.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.48 : 428.02 = 192.38 : x
  2. Step 2: Convert to fraction form
    310.48/428.02 = 192.38/x
  3. Step 3: Cross multiply
    310.48x = 428.02 × 192.38
  4. Step 4: Simplify right side
    310.48x = 82,342.49
  5. Step 5: Solve for x
    x = 82,342.49/310.48
  6. Step 6: Final answer
    x = 265.21

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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.