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Finding the Fourth Proportional to 392.72, 541.92 and 245.40

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Solution

The fourth proportional to 392.72, 541.92 and 245.40 is: 338.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.72 : 541.92 = 245.40 : x
  2. Step 2: Convert to fraction form
    392.72/541.92 = 245.40/x
  3. Step 3: Cross multiply
    392.72x = 541.92 × 245.40
  4. Step 4: Simplify right side
    392.72x = 132,987.17
  5. Step 5: Solve for x
    x = 132,987.17/392.72
  6. Step 6: Final answer
    x = 338.63

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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.