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Finding the Fourth Proportional to 392.45, 541.69 and 245.03

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Solution

The fourth proportional to 392.45, 541.69 and 245.03 is: 338.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.45 : 541.69 = 245.03 : x
  2. Step 2: Convert to fraction form
    392.45/541.69 = 245.03/x
  3. Step 3: Cross multiply
    392.45x = 541.69 × 245.03
  4. Step 4: Simplify right side
    392.45x = 132,726.98
  5. Step 5: Solve for x
    x = 132,726.98/392.45
  6. Step 6: Final answer
    x = 338.21

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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.