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Finding the Fourth Proportional to 393.49, 542.98 and 218.83

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Solution

The fourth proportional to 393.49, 542.98 and 218.83 is: 301.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.49 : 542.98 = 218.83 : x
  2. Step 2: Convert to fraction form
    393.49/542.98 = 218.83/x
  3. Step 3: Cross multiply
    393.49x = 542.98 × 218.83
  4. Step 4: Simplify right side
    393.49x = 118,816.50
  5. Step 5: Solve for x
    x = 118,816.50/393.49
  6. Step 6: Final answer
    x = 301.96

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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.