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Finding the Fourth Proportional to 392.86, 541.78 and 245.39

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Solution

The fourth proportional to 392.86, 541.78 and 245.39 is: 338.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.86 : 541.78 = 245.39 : x
  2. Step 2: Convert to fraction form
    392.86/541.78 = 245.39/x
  3. Step 3: Cross multiply
    392.86x = 541.78 × 245.39
  4. Step 4: Simplify right side
    392.86x = 132,947.39
  5. Step 5: Solve for x
    x = 132,947.39/392.86
  6. Step 6: Final answer
    x = 338.41

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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.