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Finding the Fourth Proportional to 243.24, 336.12 and 221.64

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Solution

The fourth proportional to 243.24, 336.12 and 221.64 is: 306.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.24 : 336.12 = 221.64 : x
  2. Step 2: Convert to fraction form
    243.24/336.12 = 221.64/x
  3. Step 3: Cross multiply
    243.24x = 336.12 × 221.64
  4. Step 4: Simplify right side
    243.24x = 74,497.64
  5. Step 5: Solve for x
    x = 74,497.64/243.24
  6. Step 6: Final answer
    x = 306.27

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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.