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Finding the Fourth Proportional to 392.28, 541.42 and 245

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Solution

The fourth proportional to 392.28, 541.42 and 245 is: 338.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.28 : 541.42 = 245 : x
  2. Step 2: Convert to fraction form
    392.28/541.42 = 245/x
  3. Step 3: Cross multiply
    392.28x = 541.42 × 245
  4. Step 4: Simplify right side
    392.28x = 132,647.90
  5. Step 5: Solve for x
    x = 132,647.90/392.28
  6. Step 6: Final answer
    x = 338.15

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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.