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Finding the Fourth Proportional to 392.74, 542.09 and 245.29

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Solution

The fourth proportional to 392.74, 542.09 and 245.29 is: 338.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.74 : 542.09 = 245.29 : x
  2. Step 2: Convert to fraction form
    392.74/542.09 = 245.29/x
  3. Step 3: Cross multiply
    392.74x = 542.09 × 245.29
  4. Step 4: Simplify right side
    392.74x = 132,965.32
  5. Step 5: Solve for x
    x = 132,965.32/392.74
  6. Step 6: Final answer
    x = 338.56

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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.