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Finding the Fourth Proportional to 73.72, 110.48 and 68.60

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Solution

The fourth proportional to 73.72, 110.48 and 68.60 is: 102.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.72 : 110.48 = 68.60 : x
  2. Step 2: Convert to fraction form
    73.72/110.48 = 68.60/x
  3. Step 3: Cross multiply
    73.72x = 110.48 × 68.60
  4. Step 4: Simplify right side
    73.72x = 7,578.93
  5. Step 5: Solve for x
    x = 7,578.93/73.72
  6. Step 6: Final answer
    x = 102.81

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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.