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Finding the Fourth Proportional to 68.43, 103.11 and 55.22

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Solution

The fourth proportional to 68.43, 103.11 and 55.22 is: 83.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.43 : 103.11 = 55.22 : x
  2. Step 2: Convert to fraction form
    68.43/103.11 = 55.22/x
  3. Step 3: Cross multiply
    68.43x = 103.11 × 55.22
  4. Step 4: Simplify right side
    68.43x = 5,693.73
  5. Step 5: Solve for x
    x = 5,693.73/68.43
  6. Step 6: Final answer
    x = 83.21

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.