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Finding the Fourth Proportional to 392.99, 542.30 and 218.34

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Solution

The fourth proportional to 392.99, 542.30 and 218.34 is: 301.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.99 : 542.30 = 218.34 : x
  2. Step 2: Convert to fraction form
    392.99/542.30 = 218.34/x
  3. Step 3: Cross multiply
    392.99x = 542.30 × 218.34
  4. Step 4: Simplify right side
    392.99x = 118,404.69
  5. Step 5: Solve for x
    x = 118,404.69/392.99
  6. Step 6: Final answer
    x = 301.30

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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.