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Finding the Fourth Proportional to 392.82, 542.44 and 300.20

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Solution

The fourth proportional to 392.82, 542.44 and 300.20 is: 414.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.82 : 542.44 = 300.20 : x
  2. Step 2: Convert to fraction form
    392.82/542.44 = 300.20/x
  3. Step 3: Cross multiply
    392.82x = 542.44 × 300.20
  4. Step 4: Simplify right side
    392.82x = 162,840.49
  5. Step 5: Solve for x
    x = 162,840.49/392.82
  6. Step 6: Final answer
    x = 414.54

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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.