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Finding the Fourth Proportional to 243.72, 336.26 and 218.81

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Solution

The fourth proportional to 243.72, 336.26 and 218.81 is: 301.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.72 : 336.26 = 218.81 : x
  2. Step 2: Convert to fraction form
    243.72/336.26 = 218.81/x
  3. Step 3: Cross multiply
    243.72x = 336.26 × 218.81
  4. Step 4: Simplify right side
    243.72x = 73,574.28
  5. Step 5: Solve for x
    x = 73,574.28/243.72
  6. Step 6: Final answer
    x = 301.88

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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.