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Finding the Fourth Proportional to 243.36, 365.06 and 81

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Solution

The fourth proportional to 243.36, 365.06 and 81 is: 121.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.36 : 365.06 = 81 : x
  2. Step 2: Convert to fraction form
    243.36/365.06 = 81/x
  3. Step 3: Cross multiply
    243.36x = 365.06 × 81
  4. Step 4: Simplify right side
    243.36x = 29,569.86
  5. Step 5: Solve for x
    x = 29,569.86/243.36
  6. Step 6: Final answer
    x = 121.51

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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.