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Finding the Fourth Proportional to 393.23, 542.64 and 218.56

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Solution

The fourth proportional to 393.23, 542.64 and 218.56 is: 301.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.23 : 542.64 = 218.56 : x
  2. Step 2: Convert to fraction form
    393.23/542.64 = 218.56/x
  3. Step 3: Cross multiply
    393.23x = 542.64 × 218.56
  4. Step 4: Simplify right side
    393.23x = 118,599.40
  5. Step 5: Solve for x
    x = 118,599.40/393.23
  6. Step 6: Final answer
    x = 301.60

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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.