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Finding the Fourth Proportional to 392.97, 542.28 and 218.33

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Solution

The fourth proportional to 392.97, 542.28 and 218.33 is: 301.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.97 : 542.28 = 218.33 : x
  2. Step 2: Convert to fraction form
    392.97/542.28 = 218.33/x
  3. Step 3: Cross multiply
    392.97x = 542.28 × 218.33
  4. Step 4: Simplify right side
    392.97x = 118,395.99
  5. Step 5: Solve for x
    x = 118,395.99/392.97
  6. Step 6: Final answer
    x = 301.29

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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.