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Finding the Fourth Proportional to 228.05, 342.13 and 81.81

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Solution

The fourth proportional to 228.05, 342.13 and 81.81 is: 122.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.05 : 342.13 = 81.81 : x
  2. Step 2: Convert to fraction form
    228.05/342.13 = 81.81/x
  3. Step 3: Cross multiply
    228.05x = 342.13 × 81.81
  4. Step 4: Simplify right side
    228.05x = 27,989.53
  5. Step 5: Solve for x
    x = 27,989.53/228.05
  6. Step 6: Final answer
    x = 122.74

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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.