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Finding the Fourth Proportional to 392.50, 541.78 and 252.68

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Solution

The fourth proportional to 392.50, 541.78 and 252.68 is: 348.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.50 : 541.78 = 252.68 : x
  2. Step 2: Convert to fraction form
    392.50/541.78 = 252.68/x
  3. Step 3: Cross multiply
    392.50x = 541.78 × 252.68
  4. Step 4: Simplify right side
    392.50x = 136,896.97
  5. Step 5: Solve for x
    x = 136,896.97/392.50
  6. Step 6: Final answer
    x = 348.78

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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.