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Finding the Fourth Proportional to 392, 541.12 and 254.40

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Solution

The fourth proportional to 392, 541.12 and 254.40 is: 351.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    392 : 541.12 = 254.40 : x
  2. Step 2: Convert to fraction form
    392/541.12 = 254.40/x
  3. Step 3: Cross multiply
    392x = 541.12 × 254.40
  4. Step 4: Simplify right side
    392x = 137,660.93
  5. Step 5: Solve for x
    x = 137,660.93/392
  6. Step 6: Final answer
    x = 351.18

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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.