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Finding the Fourth Proportional to 392.88, 542.12 and 218.16

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Solution

The fourth proportional to 392.88, 542.12 and 218.16 is: 301.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.88 : 542.12 = 218.16 : x
  2. Step 2: Convert to fraction form
    392.88/542.12 = 218.16/x
  3. Step 3: Cross multiply
    392.88x = 542.12 × 218.16
  4. Step 4: Simplify right side
    392.88x = 118,268.90
  5. Step 5: Solve for x
    x = 118,268.90/392.88
  6. Step 6: Final answer
    x = 301.03

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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.