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Finding the Fourth Proportional to 243.21, 336.11 and 216.21

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Solution

The fourth proportional to 243.21, 336.11 and 216.21 is: 298.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.21 : 336.11 = 216.21 : x
  2. Step 2: Convert to fraction form
    243.21/336.11 = 216.21/x
  3. Step 3: Cross multiply
    243.21x = 336.11 × 216.21
  4. Step 4: Simplify right side
    243.21x = 72,669.26
  5. Step 5: Solve for x
    x = 72,669.26/243.21
  6. Step 6: Final answer
    x = 298.79

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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.