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Finding the Fourth Proportional to 228.24, 342.17 and 81.90

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Solution

The fourth proportional to 228.24, 342.17 and 81.90 is: 122.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.24 : 342.17 = 81.90 : x
  2. Step 2: Convert to fraction form
    228.24/342.17 = 81.90/x
  3. Step 3: Cross multiply
    228.24x = 342.17 × 81.90
  4. Step 4: Simplify right side
    228.24x = 28,023.31
  5. Step 5: Solve for x
    x = 28,023.31/228.24
  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.