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Finding the Fourth Proportional to 69.61, 103.75 and 67.44

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Solution

The fourth proportional to 69.61, 103.75 and 67.44 is: 100.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.61 : 103.75 = 67.44 : x
  2. Step 2: Convert to fraction form
    69.61/103.75 = 67.44/x
  3. Step 3: Cross multiply
    69.61x = 103.75 × 67.44
  4. Step 4: Simplify right side
    69.61x = 6,996.90
  5. Step 5: Solve for x
    x = 6,996.90/69.61
  6. Step 6: Final answer
    x = 100.52

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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.