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Finding the Fourth Proportional to 393.47, 542.99 and 218.82

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Solution

The fourth proportional to 393.47, 542.99 and 218.82 is: 301.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.47 : 542.99 = 218.82 : x
  2. Step 2: Convert to fraction form
    393.47/542.99 = 218.82/x
  3. Step 3: Cross multiply
    393.47x = 542.99 × 218.82
  4. Step 4: Simplify right side
    393.47x = 118,814.90
  5. Step 5: Solve for x
    x = 118,814.90/393.47
  6. Step 6: Final answer
    x = 301.97

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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.