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Finding the Fourth Proportional to 68.66, 102.42 and 67.22

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Solution

The fourth proportional to 68.66, 102.42 and 67.22 is: 100.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.66 : 102.42 = 67.22 : x
  2. Step 2: Convert to fraction form
    68.66/102.42 = 67.22/x
  3. Step 3: Cross multiply
    68.66x = 102.42 × 67.22
  4. Step 4: Simplify right side
    68.66x = 6,884.67
  5. Step 5: Solve for x
    x = 6,884.67/68.66
  6. Step 6: Final answer
    x = 100.27

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.