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Finding the Fourth Proportional to 228.11, 342.16 and 81.86

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Solution

The fourth proportional to 228.11, 342.16 and 81.86 is: 122.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.11 : 342.16 = 81.86 : x
  2. Step 2: Convert to fraction form
    228.11/342.16 = 81.86/x
  3. Step 3: Cross multiply
    228.11x = 342.16 × 81.86
  4. Step 4: Simplify right side
    228.11x = 28,007.51
  5. Step 5: Solve for x
    x = 28,007.51/228.11
  6. Step 6: Final answer
    x = 122.78

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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.