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Finding the Fourth Proportional to 68.74, 103.17 and 61.44

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Solution

The fourth proportional to 68.74, 103.17 and 61.44 is: 92.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.74 : 103.17 = 61.44 : x
  2. Step 2: Convert to fraction form
    68.74/103.17 = 61.44/x
  3. Step 3: Cross multiply
    68.74x = 103.17 × 61.44
  4. Step 4: Simplify right side
    68.74x = 6,338.76
  5. Step 5: Solve for x
    x = 6,338.76/68.74
  6. Step 6: Final answer
    x = 92.21

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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.