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Finding the Fourth Proportional to 392.70, 542.31 and 245.46

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Solution

The fourth proportional to 392.70, 542.31 and 245.46 is: 338.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.70 : 542.31 = 245.46 : x
  2. Step 2: Convert to fraction form
    392.70/542.31 = 245.46/x
  3. Step 3: Cross multiply
    392.70x = 542.31 × 245.46
  4. Step 4: Simplify right side
    392.70x = 133,115.41
  5. Step 5: Solve for x
    x = 133,115.41/392.70
  6. Step 6: Final answer
    x = 338.97

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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.