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Finding the Fourth Proportional to 243.53, 365.28 and 81.21

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Solution

The fourth proportional to 243.53, 365.28 and 81.21 is: 121.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.53 : 365.28 = 81.21 : x
  2. Step 2: Convert to fraction form
    243.53/365.28 = 81.21/x
  3. Step 3: Cross multiply
    243.53x = 365.28 × 81.21
  4. Step 4: Simplify right side
    243.53x = 29,664.39
  5. Step 5: Solve for x
    x = 29,664.39/243.53
  6. Step 6: Final answer
    x = 121.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.